Pulpdom's greatest occult detective returns! Volume 2 of the complete reprinting of the Semi Dual series collects three more never-before-reprinted metaphysical, psychological and speculative science adventures, all from the pages of the Munsey pulp magazine, The Cavalier. This volume contains the next three stories: "The Purple Light," "The Master Mind," and "Rubies of Doom," exactly as they were written by Semi Dual creators J.U. Giesy and Junius B. Smith. The Complete Cabalistic Cases of Semi Dual, the Occult Detector, Volume 2: 1912-13 also contains an all-new introduction by Garyn Roberts, Ph.D.