The film story depicts Emile Buisson, following the death of his wife and child, escaping from a psychiatric institution in 1947 and returning to Paris. Buisson, who three years later would become France's public enemy number one, begins a murderous rampage through the French capital.

• Adel Productions
• Lira Films
• Alain Delon
• Jean-Louis Trintignant
• Claudine Auger
• Renato Salvatori
• André Pousse
• Marco Perrin
• Henri Guybet
• Maurice Barrier