"It's terrible to think of it," he said at last. "Still, I suppose it must be done." "It must," returned Lord Hastings. "Will there be need of a trial first, sir?" "A trial, of course, is only a formality. Nevertheless, he must have one." "When, sir?" "The court martial will sit in half an hour." "And will be composed of how many, sir?" "Six. Mr. Templeton, yourself, Johnson, Smith, one of the sailors and myself. It will sit here in my cabin." "Very good, sir. I shall be here." Half an hour later the prisoner faced his judges. Lord Hastings addressed him. "Prisoner," he said, "what have you to say in extenuation of your actions?" "Nothing," was the brief response. "Have you anything to plead why sentence of death should not be pronounced on you?" continued Lord Hastings. "I have nothing whatever to say," was the firm response. The six judges consulted together for some moments. Then Lord Hastings turned again to the prisoner. "As president of this court martial," he said slowly, "I sentence you to be shot at six o'clock." He drew a watch from his pocket and glanced at it. "It is now five," he said. "You have one hour in which to prepare yourself to meet your maker." The prisoner bowed his head in assent. Then, at a signal, he arose and was conducted from the room. Six o'clock came all too swiftly for Frank and Jack, who could but look with horror upon this cold blooded way of disposing of a man, simply because he was a spy. The D-16, feeling her way carefully, had come to the surface, and now the prisoner was conducted to the bridge. He took his stand at one end and waving aside a proffered bandage, faced his executioners unflinchingly. A firing squad of six men took their positions opposite him. Much to his chagrin, Jack had been put in command of the squad, and it was his duty to give the word that would snuff out the life of a fellow being. But Jack was not the lad to refuse to obey orders, and now he stood behind the squad. "Ready," he said calmly. "Take aim!" But before he could give the word to fire, the prisoner, who up to this moment had been standing with folded arms, suddenly flung himself into the sea. "Fire!" cried Jack, and the sailors poured a volley after him. Then all rushed to the rail and watched for him to reappear. A few minutes later a head appeared a short distance away. It became at once apparent that the spy had not been touched. Immediately Jack rushed to the side of the vessel and also flung himself into the sea. The erstwhile prisoner saw his action and struck out vigorously toward the south, where, in the gathering darkness, he could make out dimly a strip of land. But Jack was a powerful swimmer and gained rapidly on the spy. Perceiving that he could not out-swim his pursuer, the spy slackened his stroke, and just as Jack came up to him, dived. As he went down, he caught Jack by the legs and pulled him under also.