A committee on police corruption investigates Baretta after his partner takes a bribe in order to support his girlfriend's expensive tastes.

After an undercover policewoman is killed, Baretta poses as a fugitive gangster in order to infiltrate a mansion that the syndicate runs as a house of illicit pleasures.

Baretta begins to suspect that a rash of petty burglaries is actually the result of his mentally challenged friend's efforts to emulate Robin Hood.