In a small Italian village live a group of men, each as miscreant as the next. Among them is the baker, violent and miserly. One day, to benefit from an inheritance, he has to distribute fifty kilos of bread a day to the poor for five years. At the moment of distribution, a dog comes along and takes a loaf of bread in its mouth, to take to an old hermit whom the villagers are convinced "has seen God".

Thanks to the complicity of his friend Laura, Jo, sentenced to 20 years in prison, escapes from the central prison. Hiding in an old disused mill, Jo sends his young friend to a certain Freddy, gangster and nightclub owner in Pigalle, who owes his freedom to Jo's silence. But Freddy sends two of his henchmen to the mill where Jo is hiding, to kill her.

Renowned atomic scientists are kidnapped on French soil. Inspector San-Antonio and his loyal deputy Bérurier infiltrate a gang suspected of involvement in the case, in order to trace the trail.