Hoping for a success commensurate with his previous Show Business (1945), comedian Eddie Cantor poured a lot of his own money into the RKO Radio musical If You Knew Susie. Cantor and his Show Business co-star Joan Davis are reteamed herein as ex-vaudevillians Sam and Susie Parker, who retire to a small and rather cloistered New England town. Faced with the snobbery of the local "aristocracy," Sam and Susie come to believe that they aren't worthy of their new neighbors, nor of their own children. All this changes when the Parkers find a document signed by George Washington bestowing $50,000 on one of Sam's forebears! According to the government, Sam and Susie are now owed several billion dollars interest. Sam patriotically refuses to accept the money, thereby becoming a national hero -- but not before a plenitude of comic plot twists involving gangsters Sheldon Leonard and Joe Sawyer. Cast as the Parkers' daughter Marjorie is "newcomer" Margaret Kerry, who'd actually been in films since 1936 as child actress Peggy Lynch. One of the musical highlights in If You Knew Susie is a clip from Show Business, featuring Cantor, Davis, George Murphy and Constance Moore.