chunk: As the investigation proceeds, the agents begin to become aware of the possible existence of "Suspect Zero", a "super serial killer" responsible for hundreds of deaths across all 50 states who leaves no evidence behind to link his crimes together. Another body is found in the trunk of a beaten up car, also with his eyelids cut off and cut with the crossed circle mark. The ownership of the car is traced to a halfway house where the manager admits Kulok and Mackelway to a room that was occupied by Benjamin O'Ryan for seven years. The room is filled with obsessive-compulsive sketches of the crossed circle design, 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 design represents a Zero, not a circle.