After years spent working as a prostitute in her Italian village, middle-aged Mamma Roma has saved enough money to buy herself a fruit stand so that she can have a respectable middle-class life and reestablish contact with the 16-year-old son she abandoned when he was an infant. But her former pimp threatens to expose her sordid past, and her troubled son seems destined to fall into a life of crime and violence.
The film is a parody of Disney's Fantasia, though possibly more of a challenge to Fantasia than parody status would imply. In the context of this film, "Allegro non Troppo" means Not So Fast!, an interjection meaning "slow down" or "think before you act" and refers to the film's pessimistic view of Western progress (as opposed to the optimism of Disney's original).
In a moment of madness a middle-aged, married and respectable pharmacist kills a young woman who is sun-bathing by a lake. Unable to take in what he has done, he flees from the scene of the crime and behaves as if nothing has happened. Eventually her boyfriend is charged with the crime and, in a strange twist of fate, the killer finds himself serving on the jury.
