Following the disappearance of his beautiful but mentally handicapped daughter, Avanzio Berzaghi (Raf Vallone) travels to Milan to track her down. Local detective Duca Lamberti (Frank Wolff (actor)) investigates the city's pimps and prostitutes for clues, eventually finding the girl's burnt body in a field. Apparently the pimps disposed of the young girl when they heard investigators were looking for her. Berzaghi vows to find the girl's murderer, eventually tracking down his quarry from a clue related to the girl's teddy bear. Berzaghi exacts his revenge, but finds no satisfaction from having done so.