- "The Scorpion God" (also "The Devil of Delphi") (1933)
- "The Road to Damascus" (1934)
- "The Serpent in the Sky" (1937)
- "The Silver Bullet" (1939)
Biographies:
- "Life of Saint Ninian" (1930)
Other non-fiction works:
- "The Great Pyramid" (1931)
- "Atlantis and the Great Flood" (1938)