Grace Reinhart Sachs is living the only life she ever wanted for herself. Devoted to her husband, their young son Henry, and the patients she sees in her therapy practice, her days are full of familiar things. Grace is also the author of a book You Already Know. 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 an ongoing chain of terrible revelations.