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Chicago: Popular Publications, 1936. Octavo, single issue, cover by G. Rozen, pictorial wrappers. Pulp magazine. "Yen-Sin was a sinister oriental mastermind intent on conquest. He was the master of a huge network of spies and agents and was for this reason billed as "The Invisible Menace." Fighting the evil doctor was Michael Traile, the Man Who Never Sleeps." - Tymm and Ashley, Science Fiction, Fantasy, and Weird Fiction Magazines, pp. 187-188. The second of three issues. Cook, Mystery, Detective and Espionage Magazine, pp. 200-203.