- (1926) Novel: "Hew York".
- (1915) Novel: "The Voice in the Fog". NOTE: Filmed as The Voice in the Fog (1915).
- (1906) Novel: "Half a Rogue". NOTE: Filmed as Half a Rogue (1916).
- (1914) Novel: "Pidgin Island". NOTE: Filmed as Pidgin Island (1916).
- Novel: "The Girl in His House". NOTE: Filmed as The Girl in His House (1918).
- (1917) Novel: "The Luck of the Irish". NOTE: Filmed as The Luck of the Irish (1920).
- (1919) Novel: "The Yellow Typhoon". NOTE: Filmed as The Yellow Typhoon (1920).
- (1910) Novel: "A Splendid Hazard". NOTE: Filmed as A Splendid Hazard (1920).
- (1912) Novel: "The Place of the Honeymoons". NOTE: Filmed as The Place of Honeymoons (1920).
- (1913) Novel: "Parrot & Co.". NOTE: Filmed as Not Guilty (1921).
- (1922) Novel: "The Ragged Edge". NOTE: Filmed as The Ragged Edge (1923).
- (1904) Novel: "The Man on the Box". NOTE: Filmed as The Man on the Box (1914), The Man on the Box (1925).
- (1926) Story: "The Wrong Cost". NOTE: Filmed as Pleasures of the Rich (1926).
- (1926) Story: "You Can't Always Tell". NOTE: Filmed as Womanpower (1926).
- (1928) Story: "The Beautiful Bullet". NOTE: Filmed as Danger Street (1928).
- (1920) Novel: "Drums of Jeopardy". NOTE: Filmed as The Drums of Jeopardy (1931).
- (1909) Novel: "The Goose Girl". NOTE: Filmed as The Goose Girl (1915).
- (1899) Novel: "Arms and the Woman".
- (1905) Stage: Wrote source material (novel) for "The Man on the Box", produced on Broadway. Written by Grace Livingston Furniss. Hoyt's Theatre: 3 Oct 1905-Jan 1906 (closing date unknown/111 performances). Cast: Constance Adams, Lee Baker [Broadway debut], Chester Beecroft, James A. Bliss, Sydney Booth, Lily Carthew, Henry E. Dixey, Charles E. Howson, Carlotta Nillson, Marie Nordstrom, Frederick Peters [credited as Fred W. Peters], C.N. Schaeffer, Duane Wagar, John Westley. Produced by Walter N. Lawrence.
- (1922) Stage: Wrote (credited as Harold MacGrath; w/Howard Herrick) "The Drums of Jeopardy", produced on Broadway. Melodrama/mystery. Directed by Ira Hards. Gaiety Theatre: 29 May 1922-Jun 1922 (closing date unknown/8 performances. Cast: Reginald Barlow (as "Stepan Gregory"), Marion Coakley (as "Kitty Conover"), John Colvin (as "Stemmler"), William Courtleigh (as "Cutty"), Paul Everton (as "Boris Karlov"), George Frenger (as "Antonio Bernini"), George Golden (as "Chauffeur"), C. Henry Gordon (as "John Hawksley"; Broadway debut), Victor Harrison (as "Dr. Richard Harrison"), Emmet O'Reilly (as "Kuroki"), Bernard A. Reinold (as "Edward Burlingame"), M. Tello Webb (as "Patrick Conroy"). Produced by Alfred E. Aarons. NOTE: Filmed as The Drums of Jeopardy (1923), The Drums of Jeopardy (1931).
- (1925) Novel: "The Cellini Plaque".
- (1911) Novel: "The Carpet from Baghdad". NOTE: Filmed as The Carpet From Baghdad (1915).
- (1903) Novel: "The Grey Cloak".
- (1905) Novel: "The Princess Elopes".
- (1908) Novel: "The Lure of the Mask".
- (1905) Novel: "Enchantment".
- (1920) Novel: "The Man with Three Names".
- (1924) Novel: "The World Outside".
- (1931) Novel: "The Other Passport".
- (1932) Novel: "The Green Complex".
- (1924) Novel: "The Green Stone".
- Novel: "Madam Who". NOTE: Filmed as Madam Who (1918).
- (1919) Novel: "Private Wire to Washington".
- Novel: "Hearts and Masks". NOTE: Filmed as Hearts and Masks (1914).
- Novel: "The Puppet Crown". NOTE: Filmed as The Puppet Crown (1915).
- (1930) Novel: "The Blue Rajah Murder".
- (1915) Novel: "Million Dollar Mystery".
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