Another body is found in the trunk of a car bearing an M.O. similar to Speck's murder. The ownership of the car is traced to a room in a halfway house occupied by Benjamin O'Ryan. The agents discover that the room is filled with obsessive-compulsive sketches of the crossed-circle symbol, a Bible which contains sketches of missing persons, and a book on ritual. Questioning the other occupants of the halfway house, Mackelway is told by one of them the symbol represents a zero, not a circle. Information sent by the killer leads Mackelway to O'Ryan (Ben Kingsley), who believes himself to be a former member of the FBI. The agents must decide if O'Ryan is the key to catching Suspect Zero, or if he is Suspect Zero himself.