Inspector Betti (Maurizio Merli) is transferred to Naples and immediately after his arrival receives a warm welcome from The Commandante (Barry Sullivan), the city's crime lord. Betti then goes on a personal mission against corruption and organized crime, and tries to force the syndicate out of town with any means necessary.

A drug deal goes bad and the heroin is stolen. One mob boss doesn't have his drugs and the other doesn't get his money. People are going to die until they discover who double-crossed them. Into this backdrop, Inspector Dario Mauri arrives from Milan to help clean-up Naples. His mission – find the drugs and stop the killing.

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.

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

Two friends grow up together in the Sicily of the '50s. Two different destiny, two different way of life. Could their friendship survive to the mafia shadow?

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.

On a hot summer night, Raffaele, the elderly manager of a Neapolitan counter-lot, is brutally strangled in his own accommodation.

Misadventures of a sacristan with three eager tourists, a commendatore with a sheikh, a worker who is passionate about hunting with a wife too good and an appearance mistaken for a priest with a patrician family.

When a crime boss sends out his thugs to terrorize an entire city, they do whatever they want, which includes anything from petty theft to robbing the police station in broad daylight. Napoli spara! (internationally released as Weapons of Death and Naples shoots) is a "poliziottesco" film directed by Mario Caiano in 1977. It is an unofficial sequel of Napoli violenta, of which reprises the character of Gennarino (still played by Massimo Deda).

Convict Roberto murders a guard and escapes from jail with his cellmate. Once free he joins a group of gangsters and becomes a professional hitman. The gang abduct a young woman and when one them attacks her, Roberto shoots him and takes her to an abandoned farm house…..