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.
as Jerry Blackwood
as Helen Gage
as Doctor Norris
as Henry Goering
as Carl Goering
as Inspector Gallagher
as Capt. Roland Saunders
as Lieut. John Ives
as Lieut. Douglas Thompson
as Lieut. Rene La Rue
as Lieut. Baron von Guttard
as Survivor
as Lt. Baron von Guttard
