Love Happy.

Private detective Sam Grunion (Groucho Marx) has been searching for the extremely valuable Royal Romanoff diamonds for eleven years. His investigation leads him to a troupe of struggling performers, led by Mike Johnson (Paul Valentine), who are trying to put on a musical revue called Love Happy. Harpo sneaks into the basement and watches as Lefty unpacks a sardine can marked with a Maltese cross, and swipes the can from Lefty's pocket, replacing it with an unmarked one. At the theater, unemployed entertainer Faustino the Great (Chico Marx) asks Mike for a job