A vengeful criminal targets the inspector who put him away, but the inspector survives and fakes his death. Ignoring orders to flee, he sets out to bring the fugitive back to justice.
Vincenzo 'hunchback' plans a robbery on a armored police van with his gang. Once the job is done, his gang try to kill him and absconds with the loot. Vincenzo hides in the sewers before looking up his friend Monezza who the police later interrogate for his involvement with vincenzo. Meanwhile, Vincenzo is getting revenge on his gang by killing them off one at the time in his various brutal ways.
Gianna Amicucci works in the house of the head of her hometown police force and enters the academy with a kickback from him. She is a beautiful woman (she generously sheds clothes during the film) and has to overcome her male colleagues prejudices, but she gains their respect through a series of brilliant operations.
