Alain Delon stars as Dino Barran, a doctor, alongside Charles Bronson as Franz Propp, a mercenary and safecracker, in this 1968 French-Italian heist crime film. After serving together in the French Foreign Legion, they reunite for a caper involving millions in a high-security safe. The two men become locked in during a holiday weekend as they attempt to crack the safe's combination, with unexpected consequences.