"It is," replied the officer. "This particular development of the encepholograph is so new that not many people know about it. The machine in Chicago is the only one in existence. We use truth drug writs to make it legal and still keep it secret. It isn't exactly according to Hoyle, but we have to be careful these days. It takes an expert to read the charts and, even then, only very clear thoughts can be picked up." "It sounds like something out of science fiction," Roger commented. "So did a lot of things we now take for granted," replied the officer. Late that afternoon, Roger sat aboard a rocket that screamed through the upper atmosphere on the last leg of its flight to Chicago. He watched through an eyeport as the ship lost altitude and circled the city, finally coming to rest with squealing tires on the concrete runway. As soon as the locks were opened, Roger, accompanied by a police officer, left the ship and went through the boarding tunnel into the bustling terminal building. Roger's eyes searched the crowd until they found Linda. He hurried toward her, and in a few minutes they were in each other's arms. * * * * * After two days of quiet relaxation, a plainclothes man took them to the tower of the Security Building which housed the Federal Police. The place was an electronic wonderland, with banks of instruments lining the walls. Gomez had been drugged and strapped into a large chair in the center of the room. His scalp was shaved, and several electrodes had been taped on. During the next hour and a half, the silence was broken only by the occasional click of a switch and the scratch of pens recording data. At the end of that time the electrodes were removed, and Gomez was carried from the room to sleep off the anesthesia. One after another, the prisoners went through the same process. Gradually the data added up and revealed the plan that was meant to plunge two nations into the horrors of atomic war. An officer gave quick orders. "I want all out going spaceships checked for sabotage. These men didn't know the technical details. The least obvious thing to do would be to tamper with the fuel in such a way that it would explode violently when it was heated in the motors. The nitric acid used in the booster stage would make the best reactant. The rocket would be too close to the ground to drop the booster. Better check the fuel before the rocket carrying those South American officials blasts off." He turned to Roger. "Would you like to see how we stake out a place?" "Sure," replied Roger. "Spaceports are always interesting."