In the following volumes, XIII takes up the investigation about his past. Volumes six and seven bring XIII to Greenfalls, a snowy town in the Rocky Mountains, where the story revolves around the fate of his father in the McCarthian 1950s. XIII learns that his father, Jonathan Fly, was murdered by the local Ku Klux Klan chapter, after they found out Fly's real identity was Jonathan McClane, a "red" journalist who had to flee after suffering under McCarthy's witch hunt. The Mongoose still tracks XIII with the blessing of Jonathan McClane's assassins, but XIII evades the manhunt, gets justice for the murder of his father and manages to arrest the Mongoose, who reveals that he was on Number I's boat when he shot the bullet that made XIII amnesic, but divulges no further information about Number I. The story ends with XIII finally finding his true identity as Jason McClane.