A Cameroonese police officer (Alphonse Beni) and a CIA agent (Richard Harrison) try to prevent the Pope from being assassinated by Italian terrorists during his African tour.

A reporter must race against time to prevent hordes of rotting corpses spewing forth from the gates of hell.

Cigarette smugglers in Naples run into problems with cocaine operations being set up by a rival smuggler.

Montano's corpse is found after being kidnapped by Maurice. The police think then to use the same ways criminals use and to infiltrate Tony Lo Bianco in the gang. Tony is a former FBI agent sent back to Italy for many crimes. Police Superintendent Ferrari disagrees but Tony begins his operations and meets Paulette, the Maurice's daughter. Tony and Paulette find out that perhaps Maurice is not responsible for Montano's death and they discover they have to start a real battle to save their lives.

In Naples, gangsters have seized the American ambassador. The authorities respond by assembling a special squad; to command it is Borri, a former commissioner who has a personal vendetta against the racket.