- (1909) Novel: "Elusive Isabel" (filmed as Elusive Isabel (1916), Adventures in Diplomacy (1914))
- (1906) Novel: "The Case of the Golden Plate" (filmed as The Man Behind the Mask (1936)).
- (1909) Novel: "The Diamond Master" (filmed as The Diamond Master (1929), The Diamond Queen (1921)).
- (1912) Novel: "My Lady's Garter" (filmed as My Lady's Garter (1920)).
- (1911) Novel: "The High Hand" (filmed as The High Hand (1915)).
- (1907) Novel: "The Thinking Machine" (aka "Yhe Problem of Cell 13").
- (1908) Novel: "The Simple Case of Susan" (aka "Lieutenant What's-His-Name").
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