Retired FBI agent Terrence McCaleb is asked by the LAPD to help them investigatea series of murders that have them baffled. They are the kind of ritualizedkillings that McCaleb specialized in solving with the FBI; and he is reluctantlydrawn from his peaceful new life back into the horror and excitement oftracking down a terrifying homicidal maniac. More horrifying still, thesuspect who seems to fit the profile that McCaleb develops is someone hehas known and worked with in the past LAPD homicide detective Harry Bosch...