The unknown seven: A detective story: Classic Book Guide and Free Edition
The unknown seven: A detective story: author and translator credits, catalogue synopsis, subjects and links to the Gutenberg reading formats.

The unknown seven: A detective story is catalogued by Project Gutenberg with author credits for Landon, Herman (1882–1960).
Catalogue synopsis
Project Gutenberg supplies this automated synopsis of the opening text:
"The unknown seven" by Herman Landon is a detective novel written in the early 20th century. It centers on criminologist Kingdon Cole, who is drawn into a shadowy conspiracy tied to a missing man, Malcolm Reeves, an enigmatic scientist named Professor Carmody, and a secret council of seven masked figures. Expect urban intrigue, psychological pressure, and high-stakes cat-and-mouse play set against a clandestine New York backdrop. The opening of the novel finds Kingdon Cole staking out Professor Carmody when a mysterious woman in a limousine—calling herself Miss Brown—whisks him to a hidden suite atop a skyscraper. There, seven masked men try to bribe and coerce Cole into dropping the Reeves case; when he refuses, they plunge him into darkness, warn him via speaking tube, and present the now-insane Reeves as leverage, even threatening a brain operation to break Cole’s will. Cole narrowly escapes an ether-laced “operation” by seizing a knife and overpowering a disguised “surgeon,” after which the masked group abruptly claims they did not harm Reeves and urges Cole to pursue a new lead: Doctor Dickson Latham, a nerve specialist they suspect, based in part on Reeves’s reaction to a staged resemblance. At the start of the next day, Cole visits Latham under an alias to take his measure; the doctor appears genial and competent as the excerpt ends mid-consultation.
Book and edition facts
- Title: The unknown seven: A detective story
- Author credits: Landon, Herman (1882–1960)
- Catalogue language: English
Catalogue subjects
- Detective and mystery stories
- New York (N.Y.) -- Fiction
- Private investigators -- Fiction
- Secret societies -- Fiction
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View the complete Gutenberg catalogue record. Project Gutenberg identifies this edition as public domain in the United States; that designation does not establish its copyright status in every country.
Source notes
Catalogue metadata is public domain and is supplied through Gutendex, which imports Gutenberg's machine-readable catalogue. The automated synopsis is source-supplied, not an independently verified review. Author dates above describe the credited people; no ebook release date is presented as the book's original publication date.



