In 1998, William Queen was a veteran law enforcement agent with a lifelong love of motorcycles and a lack of patience with paperwork. When a "confidential informant" made contact with his boss at the Bureau of Alcohol, Tobacco and Firearms, offering to take an agent inside the San Fernando chapter of the Mongols (the scourge of Southern California, and one of the most dangerous gangs in America), Queen jumped at the chance, not realizing that he was kick-starting the most extensive undercover operation inside an outlaw motorcycle gang in the history of American law enforcement. Nor did Queen suspect that he would penetrate the gang so successfully that he would become a fully "patched-in" member, eventually rising through their ranks to the office of treasurer, where he had unprecedented access to evidence of their criminal activity. After he spent twenty-eight months as "Billy St. John," the bearded, beer-swilling, Harley-riding gang-banger, the truth of his identity became blurry, even to himself.