Dr. Yen Sin lasted only three issues in 1936, but Keyhoe’s short-lived trilogy was a memorable attempt to given the “Yellow Peril” theme a mature and suspenseful treatment. The premise is a familiar one—a sinister Chinese super-scientist out to conquer the world. Pitted against him is the Q-Group, headed by State Department operative Michael Traile, who because of a childhood accident cannot sleep. Instead, he employs Yoga as a substitute. Under Traile are a host of secret agents, chief of whom is Eric Gordon of the F. B. I., who reports personally to Director John Glover—actually J. Edgar Hoover. Adding a dash of feminine mystique is Sin’s mysterious cohort, Sonya Damatri, while Eric Gordon’s girlfriend, Iris Vaughan, furnishes the series’ love interest.