Naturally, the government at Washington refused to meet these shameful terms. Military and naval forces were rushed to the threatened metropolis. The Atlantic Fleet steamed up from Hampton Roads under forced draught and assembled in the outer harbor. Thousands of planes gathered at Mitchell Field and other nearby aerodromes. * * * * * But where was the enemy? He must be miles up in space, Kendrick knew, as he toiled feverishly in the laboratory over his experiment after a sleepless night. For had that flying city been nearer earth, it could not have maintained invisibility without that peculiar humming vibration. Scout planes urged on by impatient squadron commanders, climbed till they reached their ceilings, searching in vain. They could encounter nothing, see nothing of the invader. Thus passed a morning of growing tension. But by noon of that day, with a bare twenty-four hours left before the expiration of the ultimatum, the disc came down, showed itself boldly. There followed stunning disasters. One salvo, and the ray shot down--the Atlantic Fleet, the pride of America, burst and melted in flaming hell. Squadrons of planes, carrying tons of bombs, frizzled like moths in the air. Mighty projectiles hurled by land batteries were deflected off on wild trajectories. Appalled, the nation and the world followed in lurid extras these crushing defeats. By nightfall of that day, all seemed lost. All opposition had been obliterated. America must capitulate or perish. It had until the next noon to decide which. * * * * * Meanwhile, in that great Brooklyn laboratory, Kendrick was working against time, besieged by frantic delegations of the nation's leaders. They knew now that their one hope lay in him. Was he succeeding? Was there even any hope? Face haggard, eyes bloodshot from lack of sleep, he waved them away, went on with his work. "I will tell you--as soon as I know." That was all he would say. Followed a night that was the blackest in all history, though the myriad stars of heaven shone tauntingly brilliant in the summer sky. At length, as dawn was breaking. Kendrick paused in his labors. "There!" he said, grimly, surveying an apparatus that seemed to involve the entire facilities of the laboratory. "It is done! Now then--will it work?" The delegation were called to witness the test. Henderson Blake was among them, as was Marjorie. She stepped forward, as he prepared to make the demonstration. "I _know_, somehow, you're going to be successful!" she murmured, pressing his hand, meeting his eyes with a smile of confidence. "I hope you're right--Marjorie!" he replied, letting slip the last word almost unconsciously. Her face colored warmly as the stepped back and rejoined her father.