In this comedy, two Yankee con artists pose as tourists visiting scenic Naples. There they intend to rob an old church. Before pulling the caper, the two enlist the aid of a local criminal. The theft succeeds, but afterwards the crooks begin double-crossing each other. Murder and mayhem ensues as one American murders the other and then heads for the airport dressed as a nun. "Her" loot is, in turn, captured by the Italian crook and his friend. The local thief then heads for Switzerland accompanied by a bogus "cardinal" who protects him. Unfortunately for the crook, the cardinal turns out to be the real thing and takes the treasure back to its original home.