Books in the Richard Knight series

Best known for writing the adventures of Philip Strange, UFO legend Donald E. Keyhoe also wrote another long-running aerial hero for the pages of Flying Aces: Richard Knight. These wild adventures also mix in elements of lost races, dinosaurs and more! Volume 3 collects the next four stories from 1938: "Hell Hammers Harbin," "Vultures of Silence," "Hell's Hangar," and "Sky-Fire Scourge."