The brothers go east in The Big Store, becoming detectives-cum-bodyguards for a department store. Crime is afoot in the store or, if in the fabrics department, by the yard. Still, our sleuths don't have a clue except in laughing matters. Chico and Harpo share a piano keyboard, beds disappear into walls, roller skates provide in-store mobility and Groucho warbles Sing While You Sell. Sold!