When Jane Ryan discovers she's pregnant with twin girls, she faces a heart wrenching decision. On her own and unable to afford to care for both babies, she sees no choice but to keep one and give up the other for adoption. But fourteen years later, Jane's decision comes full circle. "Family is everything." It's one of the first things Isabel, the twin Jane gave up, says when they unexpectedly meet. Without warning, she and her adoptive mother have moved to the town where Jane and her daughter, Harper, live. But are they really family? In the throes of a willful adolescence, Harper is as sullen as Isabel is eager to please. Still, the sisters appear to bond quickly--until unsettling things begin to happen. Disturbing pranks, questionable accidents, strange ailments. Are the girls allies, or enemies? Is Harper acting out, or is Isabel not all she seems? Soon, Jane is convinced there is something darker at work than sibling rivalry. But who is to blame, and is this only the beginning? In a novel that is both suspenseful and deeply emotional, Rosalind Noonan explores the complex challenges of motherhood, and of truly knowing what lies in another's heart--even those we love best.