Series
Lone Wolf
1. The Lone Wolf (1914)
2. The False Faces (1918)
3. Alias the Lone Wolf (1921)
4. Red Masquerade (1921)
5. The Lone Wolf Returns (1923)
6. The Lone Wolf's Son (1931)
7. Encore the Lone Wolf (1933)
8. The Lone Wolf's Last Prowl (1934)
The Lone Wolf and the Hidden Empire (1947) (with Carl W Smith)
1. The Lone Wolf (1914)
2. The False Faces (1918)
3. Alias the Lone Wolf (1921)
4. Red Masquerade (1921)
5. The Lone Wolf Returns (1923)
6. The Lone Wolf's Son (1931)
7. Encore the Lone Wolf (1933)
8. The Lone Wolf's Last Prowl (1934)
The Lone Wolf and the Hidden Empire (1947) (with Carl W Smith)
Novels
Terence O'Rourke (1904)
The Private War (1906)
The Brass Bowl (1907)
The Black Bag (1908)
The Bronze Bell (1909)
The Pool of Flame (1909)
The Fortune Hunter (1910)
No Man's Land (1910)
Cynthia of the Minute (1911)
The Bandbox (1912)
The Destroying Angel (1912)
The Day of Days (1913)
Joan Thursday (1913)
The Trey O Hearts (1914)
Nobody (1915)
Sheep's Clothing (1915)
The Dark Mirror (1920)
Linda Lee Incorporated (1922)
Baroque (1923)
Mrs. Paramor (1923)
The Road to En-dor (1925)
The Dead Ride Hard (1926)
White Fire (1926)
Lip Service (1927)
They Call It Love (1927)
Speaking of Women (1930)
The Woman in the Shadow (1930)
The Trembling Flame (1931)
Detective (1932)
The Street of Strange Faces (1934)
The Private War (1906)
The Brass Bowl (1907)
The Black Bag (1908)
The Bronze Bell (1909)
The Pool of Flame (1909)
The Fortune Hunter (1910)
No Man's Land (1910)
Cynthia of the Minute (1911)
The Bandbox (1912)
The Destroying Angel (1912)
The Day of Days (1913)
Joan Thursday (1913)
The Trey O Hearts (1914)
Nobody (1915)
Sheep's Clothing (1915)
The Dark Mirror (1920)
Linda Lee Incorporated (1922)
Baroque (1923)
Mrs. Paramor (1923)
The Road to En-dor (1925)
The Dead Ride Hard (1926)
White Fire (1926)
Lip Service (1927)
They Call It Love (1927)
Speaking of Women (1930)
The Woman in the Shadow (1930)
The Trembling Flame (1931)
Detective (1932)
The Street of Strange Faces (1934)