Detective John Hobbes (Denzel Washington) visits convicted serial killer Edgar Reese (Elias Koteas), prior to his execution. An unrepentant Reese poses a riddle for Hobbes then lapses into a strange language. He goes to his execution singing “Time Is On My Side” by The Rolling Stones. Shortly after, Hobbes receives an anonymous tip by phone of a murder. On arrival at the crime scene, Hobbes and his partner “Jonesy” (John Goodman) find that the murder victim has been killed in an identical fashion to those killed by Reese. Furthermore, the same riddle has been written on the wall. Despite warnings from his senior officer, Lieutenant Stanton (Donald Sutherland), not to pursue solving the riddle, Hobbes persists in his investigation. It leads to a highly decorated policeman who killed himself under mysterious circumstances and a pattern of events not dissimilar to those that Hobbes is currently facing.