Roger Pitman is a petty thief who makes a deal with the police to use bait money to trap other criminals. But when he gets the cash, Roger can't resist the temptation and steals part of it. He runs off to Miami Beach, but now lives in fear of the crooks that he set up as well as the police.

Stanley is a bellboy at the Fountainbleau Hotel in Miami Beach, where he performs his duties quietly and without a word to anyone. All he displays are facial expressions and a comedic slapstick style. And anything that can go wrong, does go wrong when Stanley is involved. One day, Jerry Lewis arrives at the hotel and some of the staff notice the striking resemblance.