The German Empire has unleashed Hell on Earth! The dead are climbing out of their graves and giant skeletons attack the living. Heads are detonating and soldiers are turning to bronze. But flying to the rescue like an avenging angel is America's own "Brain Devil," Captain Philip Strange, the phantom ace of G-2 Intelligence. Whether it's deadly bridges or killer broadcasts, when the Allies need a miracle they pray for Philip Strange! This sixth volume of Donald Keyhoe's flying spy features six weird World War I adventures: The Devil's Holocaust, Hell's Gateway, The Brain-Devil of G-2, Tombstone Tarmac, The Bridge of Death, and Hellions of Headless Death.