The superintendent rambled at length. The agent listened, thinking it was the same old story. The men in the moon were all great men. They had been fine, upstanding boys, all bright with spotless records. Well, of course that was to be expected in view of the rigorous weeding out program which had resulted in their selections. Only one of them was a traitor. Which one? The question drummed against his mind. "Martin wasn't just a study drudge," the superintendent was saying. "He was a fine athlete. The star forward of the Maple Hill Orphanage basketball team for three years," he added proudly. He leaned forward and lowered his voice as if taking the agent into his confidence. "We're conducting a drive to build the orphanage a new gym. Maybe you can guess the name we've selected for it?" "The Martin Larkwell Gymnasium," the agent said drily. "Right." The superintendent beamed. "That's how much we think of Martin Larkwell." As it turned out, the superintendent wasn't the only one who remembered Martin Larkwell with fondness. A druggist, a grocer, a gas station operator and a little gray lady who ran a pet shop remembered the orphan boy with surprising affection. They and many others. That's the way the chips fall, the agent thought philosophically. Let a man become famous and the whole world remembers him. Well, his job was to separate the wheat from the chaff. In the days to follow he painstakingly traced Martin Larkwell's trail from the Maple Hill Orphanage to New York, to various construction jobs along the East Coast and, finally, through other agents, to a two-year stint in Argentina as construction boss for an American equipment firm. Later the trail led back to America and, finally, to construction foreman on Project Step One. His selection as a member of the Aztec Crew stemmed from his excellent work and construction ability displayed during building of the drones. All in all, the agent thought, the record was clear and shiny bright. Martin Larkwell, Gordon Nagel, Max Prochaska, Adam Crag--four eager scrub-faced American boys, each outstanding in his field. There was only one hitch. Who was the traitor? * * * * * Crag filled Gotch in on the latest developments in Crater Arzachel. The Colonel listened without interruption until he was through, then retaliated with a barrage of questions. What was the extent of the radioactive field? What were the dimensions of Red Dog? Had any progress been made toward salvaging the cargo of Drone Baker? How was the airlock in the rill progressing? Would he please describe the rocket launcher the enemy had used to destroy the Aztec? Crag gritted his teeth to keep from exploding, barely managing civil replies. Finally he could hold it no longer. "Listen," he grated, "this is a four-man crew, not a damn army." "Certainly," Gotch interrupted, "I appreciate your difficulties. I was just--in a manner of speaking--outlining what has to be done." "As if I didn't know."