世界最繁华的城市中心，一个年轻精干的都市女人，一个富足温馨的家庭 ，一段真假难辨的梦幻生活。一部被“遗忘”在角落里的手机，预示一切早已分崩离析。
心理咨询师格蕾丝成长并定居于纽约曼哈顿，她熟悉并深爱这城市的每一个角落，还拥有一个英俊的丈夫和优秀的儿子。她曾以为生活会一直一帆风顺下去。然而，一次奢华的派对过后，她的生活突然失控了：远去的密友，一场谋杀案，失踪的丈夫，纠缠不清的警察……还有，一系列谎言。
生活被撕开了虚假的外壳，城市里到处是黑暗的角落。面对这让格蕾丝眷恋又痛苦的城市，她和儿子将何去何从？
Grace Reinhart Sachs is living the only life she ever wanted for herself, devoted to her husband, a pediatric oncologist at a major cancer hospital, their young son Henry, and the patients she sees in her therapy practice. Grace is also the author of You Should Have Known, a book in which she castigates women for not valuing their intuition and calls upon them to examine their first impressions of men for signs of serious trouble later on. But weeks before the book is published, a chasm opens in her own life: a violent death, a missing husband, and, in the place of a man Grace thought she knew, only a chain of terrible revelations. Left behind in the wake of a spreading and very public disast and horrified by the ways in which she has failed to heed her own advice, Grace must dismantle one life and create another for her child and herself.
