In this musical-comedy, Dean Martin plays an American hotel mogul who becomes smitten with a young Italian woman (Anna Maria Alberghetti) when buying a hotel in Rome. To marry this gal, he has to get her three older sisters married off.
Secret Service agents make a deal with a counterfeiting inmate to be released on early parole if he will help them recover some bogus moneymaking plates, but he plans to double-cross them.