When a psychologist's patient goes missing, a grieving detective gets close to a killer in the USA Today-bestselling author's psychological thriller. Psychologist Claire Bowen devotes her life to helping troubled women rebuild theirs. But her dream of starting a family with her new husband Robert begins to crumble as disturbing revelations from his past emerge. Meanwhile, Los Angeles Detective Joe Tanner is struggling to overcome his wife's death while raising their little girl alone. But now he faces a new kind of challenge: a breakthrough in a series of cold case murders suggests the killer has resurfaced. When one of Claire's most promising patients goes missing, Tanner suspects the truth is within his grasp. But as time runs out, both are pulled deep into an unspeakable darkness with little chance of escape.