Former FBI agent, Terry McCaleb, hero of 'Bloodwork', comes out of retirement to help the Los Angeles Police Department investigate a most baffling and bizarre killing - similar to the murders he once profiled for the FBI. Reluctantly, McCaleb is drawn from his peaceful life on Catalina Island with a new wife and daughter back into the adrenaline-fuelled tension of seeing inside a horrifyingly deranged criminal mind.
More horrifying still, the suspect who fits the profile that McCaleb develops is someone he has known and worked with in the past: a homicide detective for the LAPD who has perhaps stepped across the line and embraced the darkness he formerly combated - Harry "Hieronymus" Bosch.
