When young cop Andrea is assigned to keep watch over dangerous Godfather Sante, who's in hospital after a fake suicide attempt, the stage is set for disaster.

Returning from Switzerland to Rome, the boss prof. Salviati, called 'The Prince', finds his business compromised by Rudy, a small local bandit full of presumption, audacity and men ready to kill. Commissioner Baldi a young and brave employee, will fight against them with the help of an ex-employee Rampelli.

In Lazio, four young people named Riccetto, Girasole, Lallo and Tombarolo try to make a living by stealing what they find in the tombs of the rich buried. Being inexperienced, they often find themselves in trouble or pursued by the police.

Cencio, a roman pilferer, periodically is in prison. He meets Cesira that soon become his partner in crime. With Cesira's help Cencio try the big hit to a jewelery. But the lucky break is over.

Two wannabe bandits join the service of a dashing nobleman, who secretly masquerades as Fra Diavolo, a notorious outlaw.