Larry Borden
A private eye and his secretary probe a murder and find an international spy.
Dick Manning (as Stuart Boyd Crawford)
Nightclub gangsters hire a vaudeville act called the Three Funny Bunnies (Ritz Brothers).
Art Higgins
Miss Winters is a dancer with the Tommy Dorsey Orchestra and is asked to secretly transport a prototype magnetic mine to Puerto Rico. She thinks that she is working for the US Government, but fails to see why she would be involved.
Commentator (voice) (uncredited)
Humble stamp dealer Otto Becker has little to do with international politics, so when he receives a surprise visit from his estranged twin brother and Nazi spy, Baron Hugo von Detner, his world is thrown into turmoil. Threatening Becker with deportation, Hugo forces him to use his shop as a front for espionage.
Arnold Spencer
Dr. Gillespie supports Kildare's crusade against their hospital's deal with a rival hospital.
Tom Farwood
A celebrated New York cabbie is pressed into service for a perilous journey through World War II China.
Stuart Blanton
Married sleuths (Gracie Allen, William Post Jr.) find a corpse in their closet and round up suspects.
