One of The Washington Post's 10 Best Thrillers and Mysteries of the YearOne of Publishers Weekly's Best Books of the YearOne of Real Simple's Best Books of the Year Now in paperback, a disturbing and addictive novel of domestic suspense from an internationally bestselling author, where secrets kept hidden from spouses cause shocking surprises that hit home... There's nothing unusual about a new family moving in at 91 Trinity Avenue. Except it's her house. And she didn't sell it. Fiona Lawson is sure there's been a mistake when she comes home to find strangers moving into her house. She and her estranged husband, Bram, have a modern coparenting arrangement: bird's nest custody, where each parent spends a few nights a week with their two sons at the prized family home to maintain stability for their children. But the system built to protect their family ends up putting them in terrible jeopardy. In a domino effect of crimes and misdemeanors, the nest comes tumbling down. Now Bram has disappeared, and so have Fiona's children. As events spiral well beyond her control, Fiona will discover just how many lies her husband was weaving and how little they truly know each other. Bram's not the only one with things to hide, though, and some secrets are best kept to oneself, safe as houses.