On a quiet, sunny Sunday morning, Livy arrives at her best friend Julia's apartment for a lunch date only to find her dead. Though all the evidence supports it, Livy cannot accept the official ruling of suicide; the Julia she remembers was loud, inappropriate, joyful, outrageous and loving, not depressed. The suspicious circumstances cause Livy to dig further, and she is suddenly forced to confront a horrifying possibility: that Julia was murdered, by the same man who killed Livy's sister, Kara, eighteen years ago.
Desperate to understand the tragedies of her past and hold her unraveling life together, Livy throws herself into the search for Kara and Julia's killer, who she now believes is someone close to her family. But if that is true, can she still trust anyone? Damien, the man Julia was secretly dating? Leo, her husband's boss and a close family friend? His son Paul, her husband's best mate since college? Or even Will, her own dear husband, who has betrayed her perhaps one time too many?
And when Livy finally faces her sister's killer, and he traps her with one horrible, impossible choice, she must finally decide: is she strong enough to trust herself?