A police commissioner in a little town in the Italian Venetian province investigates a prostitution ring run by two pensioners; during his investigations he also learns that a former manicurist shacks up with ten students, the prefect's daughter prostitutes to keep her pimp, a famous doctor has sex with his young patients, a headmaster has his eyes on the pupils, a noblewoman organizes orgies in her villa, the local convent is run by a lesbian and his actual girlfriend poses for a hardcore magazine. He wants everything to come out in the open but his superiors try to put obstacles in his way.

The film focuses on Murri; the token maverick cop. He is called in after a bunch of criminals pull off a successful prison break and spend the night picking off various informers and people they don't like. Murri investigates; hooking up with one of the criminal's nieces along the way. He uses his own methods; which mostly involve breaking all the rules, and thus comes under a lot of scrutiny from his superiors who don't take too kindly to the cop's way of working.

A gang of thieves decides to hit the headquarters of Aspex. The police intervened and only two of the robbers managed to escape with the loot, while the other two are forced to take hostages to escape. The police started investigations but also the gang leader, the Cat, will be hunting the first two escaped with the loot to get money, and revenge for their escape.

John Lackland seizes the English throne, believing the rightful ruler, his brother Richard the Lionheart, to be dead. When he learns that Richard is being held captive by the German emperor and can be ransomed for a large sum of money, he refuses to pay and orders the messengers, including Sir Henry of Nottingham, to be killed. Sir Henry escapes to Sherwood Forest, which belongs to his estates. There he joins forces with a group of Anglo-Saxons and fights under the name Robin Hood against the regime of the king's traitors...

Major Paolo Altieri of the Paratroopers Corps foils the kidnapping of child, but becomes the victim himself of a violent assault by the bandits. He realises that the criminals have used an experimental machine gun that's used only in his own Corps. Altieri begins to take part in police raids on criminal activities, and ultimately discovers a conspiracy to overthrow the democratic government.

Through the childhood and adolescence of Signor Giacomo Casanova (from his memoirs), this is a description of how people lived in 18th-century Venice: their customs, habits, medicine, religion, and--most of all--the omnipresence of hypocrisy.