"Good; then we may as well be moving. The car should be here in ten minutes at the latest. You see, that's why I was late. Had a blowout aways back. We had to come in on foot. I sent my driver for another car while I hurried here, for I was afraid that you might do something rash. You see, I know more about you than you think I do." "I wish you would tell us who you are, sir," said Jack. "All in good time," replied the officer with a smile. "All in good time." Came a "honk-honk" from without. "There's our car," said the officer quietly. "Come along." Without a word the others followed him through the dark hall, out the door and down the steps, where they climbed into the car, in the rear seat, their captor taking his seat with the driver. The automobile started immediately. They rode along slowly for perhaps an hour; and they came to what the lads recognized immediately as the water front. Their captor called a halt and climbed out, motioning the lads to follow him. Immediately they had alighted, the automobile drove away. Straight down to the water their captor led the way. Jack whispered to Frank. "You can't tell me we are going to get away from here as easily as all this." "Sh-h-h!" was Frank's reply. Jack thereafter maintained a discreet silence. At the edge of the pier their captor pointed to a small rowboat in the water. "We'll get in here," he said. They did so and a moment later they were being rowed across the water by a man Frank recognized as a German sailor. The thing was becoming more complicated. A short distance ahead there now loomed up what appeared to be nothing more than a motorboat of considerable size. The rowboat approached this craft and the officer motioned his three companions to follow him aboard. They did so. Aboard, they saw that the vessel upon the deck of which they stood was in reality a pleasure yacht, now converted into a vessel of war. A look at her graceful outlines and long slender body told all three that the vessel was built for speed. Their captor had halted and waited for the three to come up with him. "Follow me below," he whispered. "I'll do the talking. Agree with whatever I say and listen carefully to my every word." The three friends obeyed. Below they were ushered into what proved to be the commander's cabin. An officer in the dress of a lieutenant commander of the German navy rose and greeted the boys' captor with a salute and an extended hand. Their captor grasped the hand. "Commander von Ludwig, I take it," said the commander of the vessel. Von Ludwig bowed. "The same, sir," he replied. "I have here a paper that gives me command of your vessel, sir. You are ordered to report to Berlin at once." "I have been expecting you, sir," was the reply. "I shall leave at once, if your boatman is still near." "I ordered him to await you," was von Ludwig's reply. The commander of the German vessel glanced at von Ludwig's three companions. "Your officers?" he asked.