Set in a gritty and decadent 1970s America, American Boogeyman follows the elusive and charming killer and the manhunt that brought him to justice involving the detective and the FBI rookie who coined the phrase ‘serial killer’.
Recently paroled from prison, legendary burglar "Doc" Riedenschneider, with funding from Alonzo Emmerich, a crooked lawyer, gathers a small group of veteran criminals together in the Midwest for a big jewel heist.
A psychotic man opens fire in a diner, murdering numerous people before killing himself. The survivors struggle in different ways following this horrendous event: a doctor doubts his own instincts and elects to use an experimental medical procedure on his wife, while a gambler believes he's on a lucky streak. A waitress begins engaging in promiscuous sex, and a young girl whose father is among the dead gains unexpected fame.
A kindly, enthusiastic, newly-arrived American immigrant from Hungary is forced to turn to a life of crime after his face is badly disfigured in a hotel fire.
In a daring robbery, some $300,000 is taken from the Italian mob. Several mafiosi are killed, as are two policemen. Lt. Pope and Capt. Mattelli are two New York City cops trying to break the case. Three small-time criminals are on the run with the money. Will the mafia catch them first, or will the police?