"To Captain Ayres: The greatest among us has died by your hand. We, the living, are pledged to avenge that loss. Within forty-eight hours you and your comrades will be wiped from the face of the earth. Nothing can save you!" This message, signed Ekar, was dropped on Dusty's drome; at the same time another Yank air field nearby was wiped out by a new horror weapon--a flaming rain that destroyed everything it touched! How can America fight this new menace? How can she keep the Blacks from crossing her borders?