Poppet / Mo Hayder.

Originally published: London: Bantam Press, 2013.

The mentally ill patients in Beechway Secure Unit are highly suggestible. A hallucination can spread like a virus. When unexplained power cuts lead to a series of horrifying incidents, fear spreads from the inmates to the staff. Amidst the growing hysteria, AJ, a senior psychiatric nurse, is desperate to protect his charges. Detective Inspector Jack Caffery is looking for the corpse of a missing woman. He knows all too well how it feels to fail to find a loved one's body. When AJ seeks Caffery's help in investigating the trouble at Beechway, each man must face a bitter truth in his own life - before staring pure evil in the eye...