Face of Murder

At least, not yet.

“Imbalanced,” she repeated, her brain starting to work.

“Yes,” Wardenford confirmed. “See, here? This one should really have something there, but there’s nothing. It doesn’t make sense this way.”

Imbalanced… what if that was the whole point? What if these were not individual equations to be taken separately, but part of a larger puzzle?

Zoe thought back to their last major case, to the Golden Ratio killer. His plans had seemed different at the beginning. It was only as he filled in more points on the map, took more victims, that the spiral shape became clear.

That was a terrible thought—that she might need more information. Need another death. But it did make a lot more sense than what they had already—which was nothing.

Zoe spun the two printouts toward herself and grabbed a pen from her pocket. She started to balance the equations out—adding them together. It was easy to see the spaces, now she understood to look for that kind of pattern. And it was easy to see the things on the second equation that stood out, begged to be put somewhere else.

She worked in a frenzy, forgetting that Wardenford was even in the room. This was more important than the interrogation. If he was right, this could change everything. Maybe they could work something out from this, some kind of formula, or a prediction of what the next equation would be. Any little clue along the way could help them figure out who the killer was.

That was, of course, assuming that it wasn’t Wardenford and he wasn’t stringing her along like a puppet, watching her dance.

Zoe paused then, looking up to see that Wardenford was watching her. Closely. She stopped writing. Perhaps that thought was right. Perhaps she was playing right into his hands, taking the bait.

“You don’t see things like others do, do you?” he asked, unexpectedly.

“What?”

“I’ve met people like you before. You’ve got a way with numbers and patterns, am I right? You’re a synesthete.”

Zoe instinctively looked toward the darkened glass, hoping the tech had left the room. If Shelley was the only one hearing this, it wouldn’t be so bad. But this was on record. Taped. Anyone could see it. She fought a rising sense of panic, her hand flying up to just below her collarbone, her neck. She felt that same stifling feeling that came when she sat in the passenger seat and the seatbelt seemed to choke her, but there was nothing there to pull away.

“I knew it. You remind me exactly of someone I mentored years ago.”

Zoe was torn between anxiety over her secret being outed, and the shock that he could tell just by looking at her. “What are you talking about?” she asked, hoping it would sound like a deflection but also prompt him to explain how he had known.

“I know brilliance when I see it. You have an instinctive way of working with the numbers, and it’s not just that. You’re constantly assessing things, sizing them up. I can recognize it because I’ve seen it before.”

“With your student,” Zoe replied, which was not an admission, but still encouraged him to go on all the same. She was walking a dangerous line. If anyone saw this, she would have to flat-out deny it—or come clean. At least not having the admission on tape was a slim comfort.

“Yes. She was gifted—just gifted. I noticed her skills in class, and invited her for some extra sessions to see if we could coax out that genius. Lo and behold, she had capabilities I had never dreamed of. To look at a math equation and know the answer, just like that.”

“What happened to her?” Zoe was desperate to know. After the news Dr. Applewhite had told her, of the student committing suicide, it was of the utmost interest to her. Had she been successful in life? Started a family, maybe?

“Ah, well, I don’t really know.” Wardenford coughed quietly, wearing an embarrassed expression. “I ended up quitting, you see. Coming over here to work instead. That was after my divorce; I had to get away. All my problems started there.”

“That is when you began drinking.”

“Right.” Wardenford sighed heavily. “That’s the part of the job I miss the most, you know? Nurturing young minds, helping them come to their full potential. Like you—putting the skills and talents they have to good use. Helping them to figure out what to do with the rest of their lives. I suppose all that is gone, now. No college anywhere near here is going to touch me, and I doubt I’ll have a good reference if I apply elsewhere.”

Maudlin self-pity. Zoe was just about to tell him to shut up and stop feeling sorry for himself, and go work on getting the things he wanted instead of drinking himself to death. Perhaps happily for her career, that was the moment that Shelley threw open the door and interrupted instead.

“Agent Rose,” Zoe remarked, surprised that she would break protocol by entering the interview room. Perhaps one of their superiors had arrived, and Shelley had come to warn her…?

“Agent Prime, a word, please,” Shelley said, moving back into the corridor to let Zoe out.

Once the door was firmly closed behind her and Wardenford was out of earshot, Shelley brandished her phone, indicating the source of the news that was spilling out of her. “They’ve found another body.”

Shelley’s words rolled over Zoe like a wave. There was another death. It had probably happened while Wardenford was in custody, which would mean that he was innocent.

But maybe it held another equation—another clue.

Zoe didn’t know whether to be pleased or dismayed. Their phantom math killer had struck again.

But that meant there was a whole wealth of more clues waiting, any of which might help them catch him and stop him in his tracks.

CHAPTER FIFTEEN

Zoe hit the brakes, almost sending the car into a skid. She had been driving so fast down the wide, leafy suburban streets that she had almost missed the police car parked up ahead and gone right into the back of it.

They had landed outside a huge Georgian colonial, not at all out of place in this expensive neighborhood. The one thing that did set it apart were the white-suited forensics experts and uniformed police bustling outside or rushing in and out of the door in a near-perpetual routine.

Shelley was already out of her seatbelt and the door by the time Zoe had turned the engine off, and she wasn’t far behind her. They both ran across the neatly kept lawn to the entrance, flashing their badges quickly at the policeman who tried to stop them approaching from the sidewalk.

The commanding officer at the scene met them at the door, knowing from a glance that they were the FBI agents he had been told to wait for.

“Agents, you’re going to want to come and see this. It’s a brutal one. Looks like another one of our math killer’s hits.”

They followed him hurriedly up a wide staircase to a master bedroom, dodging other personnel who were coming and going with fingerprint kits and DSLRs and spare evidence bags. Zoe had already counted thirteen pairs of boots on the ground. This was clearly a big deal to the locals—and of course it would be. When wealthy neighborhoods were home to violent and brutal murders, it was normally in the interest of the sheriff or chief of police to do something about it, and fast.

“Cleaner called us in when she reported for work and found the body. Thankfully she was in the habit of speaking to her employer first rather than getting right to it, so she didn’t wipe any evidence away. The vic is a neurologist from the local hospital, Dr. Edwin North. Pretty well-known around these parts. He and his wife used to take part in all the community events, you know? Real pillars. His late wife, that is. Cancer last year.”

This running commentary was given as they ascended the stairs, and the officer paused them outside the room itself. “I’ve got to tell you ladies, this is a real bad case. Maybe you shouldn’t go in there. We’ll have the crime scene photos along to you, but you might be better off not seeing it in person.”

“We’re not ladies,” Shelley said, brushing by him. “We’re federal agents, and I assure you we can handle it.”

Zoe held back a laugh at the man’s expression, and followed her. What she saw was not at all pretty. Shelley must have been fighting hard not to show any reaction, given how emotional she normally was at crime scenes.

The doctor’s head was crushed, visibly so. There was an odd shape to his head, newly formed after his skull gave way under the pressure. Oblong, distorted. His eyes had bulged out under the force, his eye sockets broken at their upper edge. Brain matter and blood, along with fragments of skull, decorated the headboard.

He was lying in bed, alone, still partially covered by a blanket. He was half-dressed, giving the impression that he had stolen into the bedroom for a quick nap and nothing more. It was a nap that he was never going to wake up from again.

But most exciting of all was the link that Zoe had been waiting for. His plain shirt had been ripped open, traces of blood still clinging to it where it had been thrown aside. Across his bare torso, another equation was written in thick black numbers and letters.

The blood was still wet. He had been killed in the last hour or less. Even as they watched, a small piece of brain matter that had attached itself to the wall slowly peeled away and dropped down. This crime scene was still settling into place.

This had happened while they were at James Wardenford’s home, arresting him, or at least in the minutes before or after. No way he could have got home, washed himself off, and played the part of the drunkard in time. Even the first part would have been too much of a stretch, given the distance between the homes. Wardenford was in the clear.

Shelley was taking it all in, breathing through her mouth rather than her nose, and Zoe took that as her cue. She was long used to gruesome scenes like these, and it was all just meat to her. Better that she take the lead while Shelley found her feet.

“What was his schedule for today?” Zoe asked.

The policeman flipped back a page in his notebook. “He finished his last shift early this morning, and then was due back in this evening at nine to handle a late shift. Looks like he was getting some shut-eye beforehand.”

Shelley had recovered enough to draw closer to the body. “Any initial forensics reports?”

The officer followed her, leaning in to point at various parts of the skull with an outstretched pen. “They tell me the doctor was stunned first with a single blow, here. We can only just see the edge of the impact mark under all the rest of it, but it was likely solidly across the front of his head. Enough that even if he woke up, he’d have been out of it. Difficult for him to fight back at all.”

Shelley nodded, while Zoe ranged around the room, careful where she stepped. She was making calculations. She knew it took around a thousand pounds of force to cause the average skull fracture. Their killer certainly was not heavy or strong enough to provide that force himself—so he must have used something heavy, and thrown it down on top of the victim’s head.

“Have you recovered the weapon?” she asked.

Their guide, as well as the three forensics officials still working in the room, all shook their heads.

“Heavy, but thin,” Shelley suggested, studying the impact marks on the man’s face.

Zoe nodded approvingly. “No wider than my hand. Dropped three or four times, with decreasing force each time. Our killer was running out of strength.”

“Then, did he bring it with him? Or take it from the house?”

Zoe thought that over. “Interesting question. Either he planned in advance very carefully, or he took an opportunity when he found one. What do we think?”

“He seems like both. It’s a paradox, this case. Planned and premeditated—he waited for the professor. Took the student somewhere that wasn’t covered by surveillance. But the killings themselves are rage-driven, spontaneous. Using the environment.”

“How did he get in?” Zoe directed her question at the officer.

“Back door had been sabotaged. It’s almost as old as the house, beautiful wood paneling. Someone carefully and slowly sawed through it, put their hand through one of the panels, and turned the key from the outside to let themselves in. The doctor had ambient noise playing in here over his smart speakers. He wouldn’t have heard a thing, I don’t think.”

Zoe was done with the scene; she knew everything she needed to, from there at least. Nothing contradicted her earlier thoughts that the killer would be five foot nine, of average build, but perhaps a little muscular. Now she could let herself indulge in the one thing she was really interested in.

She took out her phone and started taking photographs of the equation, angling herself in to get the best shots. Shelley and the others in the room continued low conversations, but Zoe tuned them out, only keeping herself vaguely aware of what they were saying in case something important came up.

The shots taken, Zoe drifted down out of the room and down the corridor, lightly nudging the next door open with her elbow so as to avoid touching the handle. There was light afternoon sun streaming through the large windows, illuminating a miniature gym room with a treadmill set up to face the view.

Zoe moved past it, examining the other items. A large blue balance ball, several straps and lengths of stretchy material used for strength training. A rowing machine, low on the ground, with an empty water bottle still fitted into the appropriate slot.

Weights, stacked up against the far wall. Zoe counted their number and value, noted the thicker layer of dust on the bottom weights—the heaviest—compared to the top. By the pyramid-like stand was a bar, the kind you thought of when you imagined old-fashioned weightlifters. There were several flat, circular weights stacked beside it, evidently used to increase or decrease the weight on the bar as you wished.

Zoe crouched, her attention suddenly caught by something. And yes—there it was. On the edge of one of the larger weights, concentrated much more in one area with almost nothing further along the circle. Blood and fragments of brain and skull.

“In here!” she shouted, sure now that she was looking at the murder weapon.

Shelley arrived fast, the forensics people hot on her heels. Zoe moved out of the way to allow them in, pointing out the incriminating evidence. She looked over the rest of the room more closely, seeking another sign of their killer’s presence. A footprint in undisturbed dust, a smudge from a finger, anything that would help.

“What are these here?”

Shelley’s voice snapped Zoe out of her concentration. The forensics team rushed over to where Shelley was pointing, on the floor just by the dropped weight.

“Strands of hair,” one of them muttered, taking out an evidence bag. “Very short. Well spotted.”

“It could be the victim’s,” another of them pointed out, his voice muffled by the mask he wore over his mouth.

“One dark and one gray,” Shelley said. “The victim looks to have been blond. From here, at least.”

The two hairs were lifted with fine tweezers, dropped into the waiting evidence bag, and marked. “We’ll have them analyzed. With any luck, there will be enough of the hair follicle on there to get us a match.”

“We might have our killer,” Shelley said, with such obvious glee that it sent a thrill up Zoe’s spine. She was right. That kind of break could crack the whole case wide open, give them a name. Once they had that, they could get him in for questioning, get him to tell them everything. Hairs weren’t always worth what they used to be in a courtroom, but a confession was.

And this was exactly the kind of evidence that Zoe knew Shelley could put to good use in extracting a confession.

All the tools they needed to close the case may already have been sitting in that evidence bag.

CHAPTER SIXTEEN

Zoe walked back into the interrogation room, holding a fresh set of color prints that were still warm from the machine that had spit them out.

“Oh, you’re back,” Wardenford said. “I thought you might have forgotten about me.”

Zoe eyed his hands and spotted the telltale shake. He was no doubt anxious to get out of FBI custody and go home for a drink. He’d been with them for hours now, and he was a serious alcoholic. The ratio in his bloodstream was decreasing, leaving behind the physical symptoms he would no doubt do anything to avoid.

Zoe had done anything but forget about Wardenford. During the drive back to HQ, she had formulated a plan. Shelley would go to the forensics lab and encourage a rush on the hair that they had found, using her natural charm to get it done quicker than Zoe could. Meanwhile, Zoe would talk to their former suspect.

Maybe it was obvious now that he was innocent of being the killer, but that didn’t mean they needed to let him go right away. He had been able to glean something, at least, from the equations—and he had spotted Zoe’s abilities right away. That meant that, for now at least, he was an asset.

An asset who could help them with this latest piece of the puzzle.

“Take a look at these,” Zoe said, dropping the photographs in front of him and taking her seat.

She was banking on the fact that Wardenford would be distracted enough by the allure of the mathematical puzzle to not notice that he had now been proven innocent. Just as she herself would not be able to resist attempting to work it out. True to form, he snatched up the pictures immediately, his lips moving silently as his eyes traced over the new equation.

Zoe watched him carefully as she had before. There was still no flicker of recognition, not that she could see; only eagerness to take on a challenge. She had harbored the small suspicion that Wardenford could still have been involved, with an accomplice taking down North, but now that was gone. His reaction coupled with the shaking of his hands, which were not steady enough to tackle a victim or write out a clear equation, told her everything that she needed to know.

Dr. Edwin North’s family and colleagues may hold more answers. Shelley would move on to talking with them after she had visited the lab, but Zoe wanted to be here. Working on this. She still felt that this was the most important part of it all—that putting the equations together might reveal a larger solution, something that required lengthy workings and complex enough math to stump even the experts.

Even Zoe, until, she hoped, enough was revealed to facilitate that breakthrough.

The only sound in the interrogation room was the ticking of the clock above the door and a slight shuffle of papers now and then, as Zoe and Wardenford both studied copies of the photographs in silence. The equation was just as before: seeming to make sense up to a point, then disintegrating into nonsense. There was a mismatch somewhere, something that did not fit.

“It’s wrong,” Wardenford eventually declared, planting his hands firmly onto the tabletop to hide their shaking. “Just the same as the other two. The last part is broken.”

Zoe had already reached the same conclusion, but there was something about what he said that drew her attention. “The last part?”

“Yes, the final three lines. Look at them—they’re totally unbalanced against the rest of it. This one even switches to different symbols. Where is N in those lines? The first section seems weighted towards using N as a crucial part of the equations, where it does not appear at all in the end part.”

Zoe cast her eyes over the equation again, though her memory had already told her he was right. The last three lines… was there something in that?

Seized by a sudden inspiration, she flipped back through her notebook to where she had written out the first two equations. “There must be a connection between all three,” she said.

“That’s a false equivalency,” Wardenford shook his head. “Just because the same person wrote the three equations on bodies in the same way, does not necessarily mean that they are part of the same overarching equation or connected in a further way.”

Zoe could not listen to him. How could she? If he was right, then there was no way to solve the equations. And if there was no way to solve them, then there was no extra clue hiding in there which would help her to link the three victims and trace the link back to the killer.

There had to be some kind of connection.

There just had to be.

“You’re wasting your time,” Wardenford insisted, but Zoe was no longer hearing him. She started to scribble out the last three lines of each of the equations on the back of one of the photographs, in order. Just the last three lines, the three that didn’t make any sense in each of the cases.

When she was done, she stopped and looked at it. It made a full equation in itself, and now the signs were starting to make sense. This was something that she could understand, at last. This was something—somehow—familiar?

Wardenford reached for the paper and spun it around so that he could read it, his eyes flashing from left to right over and over. It was beginning to dawn on Zoe exactly why that equation looked familiar, something rushing through the synapses in her brain to tell her just where she had seen it before—

And, oh. Oh no.

“I’ve seen this before,” Wardenford said, even as Zoe’s mouth opened to cut him off, to tell him to stop. “It’s a theoretical equation that a local mathematician came up with. It made quite a stir, actually. Her name was something—what was it now? Apple… Applewhite. Dr. Applewhite, that was it. This is her equation, in full.”

Zoe knew now what she had done. It was clear. She had been desperate for a way to make sense of it all, and so she had fallen back on something that she recognized. Just like how other people supposedly saw a face on the moon, instead of measurable craters and hills and valleys. There was no face on the moon.

In just the same sense, there was no way that Dr. Applewhite really had anything to do with this.

It couldn’t be right—it was all just a coincidence. Maybe Zoe had even copied out the equations incorrectly. She flipped back in her notebook, checking and rechecking.

“That’s your culprit, then,” Wardenford pronounced, leaning back in his chair and folding his arms at ninety-degree angles across a puffed-up chest. “Dr. Applewhite. She’s got offices somewhere nearby, does studies on people with abilities like yours. Hang on, you probably know her, don’t you? She must have finally cracked.”

Zoe’s mind was racing, trying to find a possibility which explained all of this. Coincidences happened, even if they were not statistically likely. In fact, that’s all they were: the collision of things that were somewhat likely, happening in an order which was less likely and yet still possible. In an infinite universe, everything that was possible to happen would happen. That was the theory, wasn’t it?

“This cannot be anything to do with Dr. Applewhite,” Zoe blurted out abruptly, pushing all of the photographs together into a messy pile that she could scoop up into her arms. “You are no longer a suspect, Mr. Wardenford. You are free to go. See them at the front desk about getting a taxi.”

She rushed out of the room, opening the door awkwardly with one hand holding the bundle of images against her chest, and almost collided with Shelley in the corridor.

“In here,” Shelley said, her voice harder and flatter than Zoe had ever heard it before. She barely had time to register what was going on before they were both sealed away in the observation room adjoining the interrogation room, where on the other side of the black glass James Wardenford was getting up to leave.

“How much of that did you hear?” Zoe asked, hating the tremor in her voice as she asked it. Hating the fact that there was something she hadn’t wanted anyone to hear at all.

“More than enough,” Shelley said, shaking her head. “Zoe, there’s something else you need to know. Forensics already came back on those hair follicles. They didn’t get a match in our database.”

“That does not mean anything,” Zoe pointed out. “Only that our suspect has not been previously arrested. We will be able to find a suspect eventually, and then we can test them against the hairs.”

“We already have a suspect,” Shelley said. Her voice was low and soft, but Zoe still flinched away when Shelley reached out to put a hand on her upper arm. “Z, we have to follow through on this lead. You know we do. We have a professional obligation.”