1960s, the city of Clerville. The forthcoming visit of heiress Eva Kant, who'll be bringing a famous pink diamond with her, catches the attention of Diabolik, the infallible and elusive thief whose real identity is unknown: while trying to steal the jewel, he finds himself bewitched by Eva's charm, a feeling she may be reciprocating. But the police, led by Inspector Ginko, is rapidly closing in on him...
Bologna, 1976. The paths of two aimless young friends intertwine with those of Radio Alice, a pirate radio politically aligned with the leftist student movement.