He laughed again at sight of the wondering looks in the eyes of the three; stooping, he jerked the gag from Chet's mouth. "You do not understand," he exclaimed. "I should haff explained. You see, _meine guten Freunde_, we go--ach!--you have guessed it already! We go to the Dark Moon. I am pleased to take you with me on the trip out; but coming back, I will have so much to bring--there will be no room for passengers. "I could have killed you here," he said; and his mockery gave place for a moment to a savage tone, "but the patrol ships, they are everywhere. But I have influence here und there--I arranged that your flask of gas should be charged with explosive, I discredited you, and yet I could not so great a risk take as to kill you all." "So came inspiration! I called your foolish young friend here from the hospital. I ordered him to go at once to the ship hidden where I could not find, and I signed the name of Herr Harkness." * * * * * Chet caught the silent glances of his friends who could yet smile hopefully through the other emotions that possessed them. He ground his teeth as the smooth voice of Herr Schwartzmann went on: "He led me here; the young fool! Then I sent for you--and this time I signed his name--und you came. So simple!" "Und now we go in my ship to my new world. And," he added savagely, "if one of you makes the least trouble, he will land on the Dark Moon-yess!-but he will land hard, from ten thousand feet up!" The great generator was roaring. To Chet came the familiar lift of the R. A. effect. They were beyond the R. A.; they were heading out and away from Earth; and his friends were captives through his own unconscious treachery, carried out into space in their own ship, with the hands of an enemy gripping the controls.... Chet's groan, as he turned his face away from the others who had tried to smile cheerfully, had nothing to do with the pain of his body. It was his mind that was torturing him. But he muttered broken words as he lay there, words that had reference to one Schwartzmann. "I'll get him, damn him! I'll get him!" he was promising himself. And Herr Schwartzmann who was clever, would have proved his cleverness still more by listening. For a Master Pilot of the World does not get his rating on vain boasts. He must know first his flying, his ships and his air--but he is apt to make good in other ways as well. CHAPTER III _Out of Control_ Walter Harkness had built this ship with Chet's help. They had designed it for space-travel. It was the first ship to leave the Earth under its own power, reach another heavenly body, and come back for a safe landing. But they had not installed any luxuries for the passengers.