Tristan Duchaud, an undercover internal security agent, recorded a telephone conversation between the director of an oil field platform and an unknown person, from which it followed that certain circles were plotting a major criminal operation. Suspecting Tristan of spying, the director orders him to be thrown into the sea. However, the agent, who was seriously crippled by sharks, is rescued and nursed back to health by his old friend Boudreau. Tristan hides the fact that he is alive, but he still has to “resurrect” for his wife. Now both spouses are in danger, the bandits suspect that Tristan was not killed...