Unspeakable

A therapist uncovers clues to an unsolved murder as a deadly new threat emerges in the New York Times bestselling author's psychological thriller.

A family of four is murdered in their hotel room. A single mother and her boyfriend are stabbed to death. It's a sordid history of violent crimes—separated by decades.

Olivia Barker is a therapist with no connection to the murders. But she has heard things. Stories that keep her up at night. Details that only a killer would know. A killer who could...