Charming con artist Victor "Viffer" Hansen and his friend Richard Abelsteen pull off a million-dollar scam in Sweden. Disguised as Swedish diplomats representing the royal family, they swindle Italian businessman Vittorio Fercci out of 10 million Swedish kronor by arranging a marriage between the king and Vittorio's daughter Marcellina.

Petty crook “Viffer” Hansen pulls off a daring $10 million swindle selling Copenhagen’s Rundetårn to an oil sheikh, then substitutes the loot with expertly forged bills thanks to his counterfeit friend Valde. Hounded by both the mob’s Don Luigi, who promised Viffer the hand of his shrill-voiced daughter Elvira as reward, and the betrayed sheikh’s thuggish enforcer Olfert, Viffer adopts a new disguise, suffers amnesia in a madhouse, and narrowly escapes to face the final showdown when Luigi and Elvira arrive in Denmark to collect on his broken promise.