Fiction:
* The Shadow of the Purple. (1898) A novel set in the 19th century, exploring themes of love, betrayal, and intrigue.
* The Saracinesca Series (1887-1901), a sequence of historical novels written in collaboration with F. Marion Crawford, focusing on an aristocratic Italian family in the late 19th century.
* The Man in the Cellar (1896). A mystery novel.
* The Silver Slipper (1902). A novel that was later adapted into a play.
Plays:
* The Power of the Past (1907)
* The Land of the Living (1910)
* The Stolen Story (1912)
Other Works:
* The Foundations of Success (1903). A non-fiction book on personal development and achievement.
* The Red Man’s Burden (1915). A collection of poems that expresses the author’s views on the treatment of Native Americans.
Collaborations:
* The Saracinesca Series (with F. Marion Crawford)
* The King's Pawn (with F. Marion Crawford)
Weil also wrote numerous articles and essays for various publications, and contributed to several anthologies. He is known for his romantic and adventurous narratives, often set in exotic locales, and his exploration of themes related to society, morality, and human relationships.