Here are some of his notable works:
* The Mystery of Edwin Drood (1920) - The first book in the series, which explores the various theories surrounding the unfinished Dickens novel.
* The Mystery of Edwin Drood: Continued (1921) - The second book in the series, which continues the story and offers a possible conclusion.
* The Mystery of Edwin Drood: The Final Mystery (1922) - The third and final book in the series, which provides an alternative ending to the novel.
In addition to his "Mystery of Edwin Drood" series, Stevens also wrote several other novels, including:
* The Woman in the Case (1915)
* The Mystery of the Ivory (1917)
Stevens also wrote several short stories and articles, and contributed to magazines and newspapers.