"There were two reasons," replied Bradley. "You told me that there are two Wieroo cities at the eastern end of the island. To have passed near either of them might have been to have brought about our heads hundreds of the creatures from whom we could not possibly have escaped. Again, my friends must be near this spot--it cannot be over two marches to the fort of which I have told you. It is my duty to return to them. If they still live we shall find a way to return you to your people." "And you?" asked the girl. "I escaped from Oo-oh," replied Bradley. "I have accomplished the impossible once, and so I shall accomplish it again--I shall escape from Caspak." He was not looking at her face as he answered her, and so he did not see the shadow of sorrow that crossed her countenance. When he raised his eyes again, she was smiling. "What you wish, I wish," said the girl. Southward along the coast they made their way following the beach, where the walking was best, but always keeping close enough to trees to insure sanctuary from the beasts and reptiles that so often menaced them. It was late in the afternoon when the girl suddenly seized Bradley's arm and pointed straight ahead along the shore. "What is that?" she whispered. "What strange reptile is it?" Bradley looked in the direction her slim forefinger indicated. He rubbed his eyes and looked again, and then he seized her wrist and drew her quickly behind a clump of bushes. "What is it?" she asked. "It is the most frightful reptile that the waters of the world have ever known," he replied. "It is a German U-boat!" An expression of amazement and understanding lighted her features. "It is the thing of which you told me," she exclaimed, "--the thing that swims under the water and carries men in its belly!" "It is," replied Bradley. "Then why do you hide from it?" asked the girl. "You said that now it belonged to your friends." "Many months have passed since I knew what was going on among my friends," he replied. "I cannot know what has befallen them. They should have been gone from here in this vessel long since, and so I cannot understand why it is still here. I am going to investigate first before I show myself. When I left, there were more Germans on the U-33 than there were men of my own party at the fort, and I have had sufficient experience of Germans to know that they will bear watching--if they have not been properly watched since I left."