At that instant a troop of horsemen bore down upon the struggling heap, striking right and left with their sabres and scattering the crowd in all directions, and they arrived none too soon. Jack was unconscious. Bleeding from knife wounds in half a dozen places, and his face covered with blood from a wound in the forehead where a missile of some kind had struck, he lay perfectly helpless. Rough soldier hands lifted him rudely from the ground and flung him across a horse, and then the troop galloped away. While all this was going on, Frank had tried in vain to reach the side of his friend, who he knew was in trouble of some kind, although he could not make sure what. He did not realize the true state of affairs until he had seen the troopers take his friend's body from beneath many others. "Great Scott!" he cried to himself then. "They believe Jack tried to kill the Czar! What shall I do?" The answer to this question came to him like a flash. Lord Hastings, a personal friend of the Czar, was, perhaps, the only man who, under the circumstances, would be given a hearing. Frank turned quickly and dashed madly down the street. Round corner after corner he ran at full speed, nor did he check his stride until he reached the harbor and the spot near where the submarine D-16 was anchored. A man with a rowboat hustled up at Frank's bidding, and the lad ordered him to pull for the submarine with all speed. Jumping aboard and bidding the rower to wait for him, Frank dashed madly for Lord Hastings' quarters. The commander of the D-16 rose quickly to his feet as his door was thrown violently open and Frank, gasping for breath and with pale face, stood before him. "What's the matter?" demanded Lord Hastings anxiously. "Jack--Jack--arrested," panted Frank. Lord Hastings drew close and took him by the shoulders. "Take your time," he said quietly. "Nothing was ever gained by too great haste. Get your breath and then tell me what the trouble is." For another half a minute Frank gasped on, then finally was able to speak more calmly. "Jack has been arrested," he said. "What for?" asked Lord Hastings calmly. "He's accused of trying to assassinate the Czar." "What!" cried Lord Hastings, staggering back and almost losing his composure. "It's true, sir," cried Frank. "By George, this is serious!" said Lord Hastings. "Now tell me all about it as quickly as you can." Frank did so, and Lord Hastings listened quietly until he had concluded. Then he quickly got his hat and coat, and motioning to Frank to follow, made his way to the bridge. Both climbed into the boat that had brought Frank aboard the submarine and the rower put off for shore with powerful strokes. "Is Jack in much danger, sir?" asked Frank. "I don't know," said Lord Hastings. "In times of peace, of course, he would be given a trial; but the anger of the people and the troopers now will be so great that it is hard to say what will happen." "Where are we going, sir?"