Welcome to St. Dympna Hospital for the Criminally Insane. Only the most difficult cases are sent here, and the hospital has a history of dealing with them without incident. The doctors live on the grounds and operate like a close-knit family. Their methods of treatment are often described as unorthodox, but because they handle the worst of the worst without complaint, the staff is mostly left alone. That is, until a recent outbreak of violence at the hospital forces the Department of Mental Health to send an agent to investigate. What he discovers is a hospital spiraling out of control, a staff hiding dark secrets, and a mystery within these walls unlike anything he could have ever imagined.