His mystery short The mysterious card was published in the Boston-based The Black Cat in 1895. This work had the novelty of not revealing the answer to the puzzle posed, thereby gaining widespread attention; it was followed up a year later by The mysterious card revealed. In addition to serialized short stories, he also wrote several plays.
Contents The Conquest of America: A Romance of Disaster and Victory (1916) True Detective Stories, From the Archives of the Pinkertons (1893) Careers of Danger and Daring (1898) Possessed (1920) Through the Wall (1909) The Mysterious Card (1896) The Mysterious Card Unveiled (1896)
In "Careers of Danger and Daring" the author has first of all won the distinction of getting away from the commonplace, for one who reads Mr. Moffett's recounting of the curious things he has learned of ten curious careers will have added in large measure to one's knowledge of the lives of workers with few of whom the ordinary citizen is ever brought into contact. It is a book any boy of pluck and nerve will cherish.
The Conquest of America- Based on extracts from the diary of James E. Langston, War Correspondent of the ''London Times''.
Possessed- Whatever the defects or limitations of this story, I can assure my readers that it is largely based on truth. Many of the incidents, including the dual personality phenomena, were suggested by actual happenings known to me. The doctor who accomplishes cures by occult methods is a friend of mine, who lives and practises in New York City. Seraphine, the medium, is also a real person. The episode that is explained by waves of terror passing from one apartment to another and separately affecting three unsuspecting persons is not imaginary, but drawn from an almost identical happening that I, myself, witnessed in Paris, France. And the truth about women that I have tried to tell has been largely obtained from women themselves, women in various walks of life, who have been kind enough to give me most of the opinions and experiences that are contained in Penelope's diary.
Through the Wall- A capital detective story of complicated plot and well sustained interest. Scene laid in Paris.