- (1964) Novel: "They Used Dark Forces"
- (1941) Novel: "Strange Conflict"
- (1935) Novel: "The Devil Rides Out" (filmed as The Devil Rides Out (1968))
- Novel: "The Eunuch of Stamboul" (filmed as The Spy in White (1936))
- (1953) Novel: "To the Devil a Daughter" (filmed as To the Devil a Daughter (1976)).
- (1938) Novel: "Uncharted Seas" (filmed as The Lost Continent (1968)).
- Novel: "Forbidden Territory" (filmed as Forbidden Territory (1934))
- (1933) Novel: "Such Power is Dangerous"
- (1934) Novel: "Black August"
- (1934) Novel: "The Fabulous Valley"
- (1936) Novel: "Murder Off Miami"
- (1936) Novel: "They Found Atlantis"
- (1936) Novel: "Contraband"
- (1937) Novel: "The Secret War"
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