"Police try to solve a murder on board an ocean liner."
Noah Beery
as Capt. John Holling
Astrid Allwyn
as Lila Kane
Edwin Maxwell
as Major Pope
Gustav von Seyffertitz
as Inspector Von Kessling
Ralph Lewis
as Prof. Grimson
Cornelius Keefe
as First Officer Cliff Rogers
Zeffie Tilbury
as Granny Plimpton
Boothe Howard
as Capt. Downey
Howard Hickman
as Dr. Howard
Jerry Stewart
as Edgar Morton
John M. Sullivan
as Watson
George 'Gabby' Hayes
as Joe, the Watchman
George Cleveland
as Simms, the Steward
Raymond Brown
as Spy Chief (uncredited)
Gordon De Main
as Commander Bryson (uncredited)
Olaf Hytten
as Grimson's Aide (uncredited)
George Nash
as Waiter (uncredited)
Harry Schultz
as Aide (uncredited)
Slim Whitaker
as Crewman (uncredited)
William Nigh
Director
Paul Malvern
Producer
Wellyn Totman
Screenplay
Edgar Wallace
Novel
Archie Stout
Director of Photography
Oliver Wallace
Original Music Composer
