The BKA received a statement of support from the FBI. Heinrich Lunge and his assistants, travel to the United States to investigate the case of the "thief who steals millions of dollars and leave clues at the scene of the crime". Lunge, once established, quickly investigates each track in the scenes of the crimes committed by the Riddler.
The Riddler learns that a detective is looking for it and decided to put it to test.
Heinrich Lunge may exceed the riddles and clues at the scenes of the crimes or the Riddler may exceed intellectually to the police?