Michael falls in love with an American woman while borrowing his cousin's apartment, but the discovery of the contents of her suitcases gets them involved with the police, among other troubles.

A lavish mansion hosts a grand reception attended by ambassadors, ministers, the police chief, a techno-detective, a mercenary, and two wandering beauties. A mysterious painting by Rembrandt piques the interest of some of the guests, with the host of the evening, Mr. Malaparte, hiding a priceless artistic treasure inside his home... Or maybe not?