Released from captivity in Vietnam, two American Army officers return to civilian life and discover they have acquired an insatiable taste for human flesh. A city is terrorised... as they stalk the inhabitants to satisfy their primitive appetites.
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.
