David Marin was a great military leader who occupied a high place in government. His associates were shocked when he risked his reputation and career by making a plea for Wade Trask, a man condemned to be executed for sedition. Trask was a brilliant scientist. It was said that in his latest experiment he was attempting to transplant the nervous system of one animal into the body of another. But recently his extraordinary experiment had attracted less interest than his public statements. For he dared openly to criticise the government, a violation of law for which the penalty was death. Having spoken in Trask's behalf, Marin further endangered himself by visiting the scientist to counsel and encourage him. He found Trask desperate and nearly hysterical, not because he feared his death but because he feared that his work would never be completed. Marin tried to placate him, but suddenly Trask seized a gas gun, aimed at his visitor and blasted him. When Marin regained consciousness and tried to rise from the floor, he saw that his clothing had been changed. Then he saw that his hands were different, paler, thinner. His eyesight seemed weakened. He looked at himself in the mirror and slowly understood the horror of his predicament: his mind and nervous system were encased in Trask's body, and he was doomed -- unless he found Trask and, with him, became an enemy of the government.



