"Aircraft are being shot down by a large black plane with a big "X" painted on the wing. The chief suspects are invited for the weekend to an old dark mansion."
John Carroll
as Jerry Blackwood
Lona Andre
as Helen Gage
John Elliott
as Doctor Norris
Henry Hall
as Henry Goering
Leon Ames
as Carl Goering
Willard Kent
as Inspector Gallagher
Pat Somerset
as Capt. Roland Saunders
Reed Howes
as Lieut. John Ives
Wheeler Oakman
as Lieut. Douglas Thompson
Gaston Glass
as Lieut. Rene La Rue
Hans Joby
as Lieut. Baron von Guttard
Forrest Taylor
as Survivor
John S. Peters
as Lt. Baron von Guttard
Elmer Clifton
Director
Charles R. Condon
Screenplay
Fanchon Royer
Producer
Carl Himm
Editor
Leonard L. Levinson
Production Manager
Wilfred Black
Second Unit
Frank Paul Sylos
Art Direction
Corson Jowett
Sound
Arthur Reed
Director of Photography
James Diamond