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