If You Only Knew – Kristan Higgins

A funny, frank and bittersweet look at sisters, marriage and moving on, from the New York Times bestselling author of the Blue Heron series
Letting go of her ex-husband is harder than wedding-dress designer Jenny Tate expectedespecially since his new wife wants to be Jenny's new best friend. Needing closure, Jenny trades the Manhattan skyline for her hometown up the Hudson, where she'll start her own business and bask in her sister Rachel's picture-perfect family lifeand maybe even find a little romance of her own with Leo, her downstairs neighbour, who's utterly irresistible and annoyingly distant at the same time.
Rachel's idyllic marriage, however, is imploding after she discovers what looks like her husband's infidelity. She always thought she'd walk away in this situation but now she's wavering, much to Jenny's surprise. Rachel points to their parents' perfect marriage as a shining example of patience and forgiveness; but to protect her sister, Jenny may have to tarnish that memoryand their relationshipand reveal a family secret she's been keeping since childhood.
Both Rachel and Jenny will have to come to terms with the past and the present, and find a way to help each other get what they want most of all.