Three men kidnap a young girl and keep her in a small house on an isolated beach, waiting for her father to pay up the ransom. But the youngest one, in charge of watching her, let accidentally the girl see his face and it becomes no longer possible to return her alive...
Patterning himself after the American gangster John Dillinger, the criminal (Robert Hossein) is tracked by the inspector (Charles Aznavour), a former childhood friend. Plenty of gunplay and psychology is used to trap the killer. His only tender moments are spent with his girlfriend Stella (Virna Lisi). Dillinger is cornered by the police and kills several innocent victims in a crowd during the shootout. The mob decides to take things into their own hands as they approach the doomed man with a noose when he runs out of bullets.
Isabelle (Marisa Mell) runs a nursing home for wealthy women who are trying to detox from their various obsessions. Her lover, Serge Belaiev (Robert Hossein), a petty gangster, has pulled off a big hit but his partners have denounced him to the police in order to appropriate his share of the loot. Isabelle takes him in and hides him in an attic of this strange house. In love with Isabelle, Philippe Lansac (Alberto Dalbes), the owner of the place, decides to close the castle...
