Characters played by William Gargan
Ellery Queen
Characters played by Margaret Lindsay
Nikki Porter
Characters played by Charley Grapewin
Inspector Richard Queen
Characters played by Gale Sondergaard
Mrs. Van Dorn
Characters played by Gilbert Roland
Paul Gillette
Characters played by Sig Ruman
Heinrich - Spy Leader
Characters played by James Burke
Police Sgt. Velie
Characters played by Ernst Deutsch
Dr. Morse - Lido Club Physician
Characters played by Maurice Cass
Mr. Calkus - Museum Owner
Characters played by Minor Watson
Cmdr. Lang
Characters played by Felix Basch
Helm - Lido Club Manager
Characters played by John Hamilton
Bracken - The Police Commissioner
Characters played by James Seay
Marine Sgt. Stevens
Characters played by Ludwig Donath
Reece
Characters played by Dick Wessel
The Big Sailor
Characters played by Billy Bletcher
The Small Sailor
Characters played by Willy Castello
Van Dorn Chauffeur
Characters played by Dorothy Granger
Apartment Tenant
Characters played by Grace Hayle
Overweight Woman
Characters played by William Newell
Apartment Tenant
Characters played by Jack Perrin
Marine
Characters played by Jack Rice
Railway Ticket Agent
Characters played by Arthur Space
Lido Club Desk Clerk
Characters played by Harry Strang
Marine Corporal
Characters played by Fred 'Snowflake' Toones
Train Porter
Characters played by Hans Heinrich von Twardowski
Capt. Earhardt