Captured by a ruthless criminal gang, Diabolik and Ginko find themselves face to face. Locked in a cell that has no way out, and convinced they are going to die, Diabolik reveals his mysterious past to the inspector. Meanwhile, Eva Kant and Altea are each desperately searching for their two loves. Will the paths of the two rivals cross at last?
Diabolik nearly gets caught in Inspector Ginko's latest trap, leaving his partner in crime Eva Kant behind in the escape. Furious, Eva offers Ginko her help in capturing the King of Terror, but the former has to face the return of an old flame of his: Altea, Duchess of Vallenberg.
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...
International man of mystery Diabolik and his sensuous lover Eva Kant pull off heist after heist, all while European cops led by Inspector Ginko and envious mobsters led by Ralph Valmont are closing in on them.