"The Big Store" - 1941

A detective is hired to protect the life of a singer who has recently inherited a department store, from the store's crooked manager.

The Big Store is a 1941 American comedy film directed by Charles Reisner and starring the Marx Brothers (Groucho, Harpo and Chico) that takes place in a large department store. Groucho appears as private detective Wolf J. Flywheel (a character name originating from the Marx-Perrin radio show Flywheel, Shyster, and Flywheel in the early 1930s)