Snow falls softly outside Molly Bradley's home on a frigid January night. Inside, half a dozen close friends are gathered to celebrate the fortieth birthday of Molly's psychologist husband, Jay. Everybody loves Jay, Molly most of all. Yet next morning, Molly discovers Jay dead on the floor of his office, his throat brutally slashed. Devastated, Molly tries to make sense of her husband's death. Jay was her rock, the only person who really understood the nightmare she lived through long ago. But shocking revelations are making her question if Jay was all he seemed to be—and whether someone else knows her past too.