- Novel: "Wormwood". NOTE: Filmed as Wormwood (1915).
- Novel: "Temporal Power". NOTE: Filmed as Il potere sovrano (1916).
- Novel: "Holy Orders" . NOTE: Filmed as Holy Orders (1917).
- Novel: "The Mystery of Osiris". NOTE: Filmed as Il mistero di Osiris (1919).
- Novel: "God's Good Man". NOTE: Filmed as God's Good Man (1919).
- Novel: "Innocent". NOTE: Filmed as Innocent (1921).
- Novel: "Satan's Sorger". NOTE: Filmed as Leaves From Satan's Book (1920).
- Novel: "The Young Diana". NOTE: Filmed as The Young Diana (1922).
- Novel: "Thelma, a Norwegian Princess". NOTE: Filmed as Thelma (1922), Thelma (1918), A Modern Thelma (1916)).
- (1895) Novel: "The Sorrows of Satan, or the Strange Experience of one Geoffrey Tempest, Millionaire". NOTE: Filmed as The Sorrows of Satan (1926), The Sorrows of Satan (1917)).
- Novel: "Intaquam". NOTE: Filmed as Intaquam (1969).
- Novel: "The Treasure of Heaven". NOTE: Filmed as The Treasure of Heaven (1916).
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