Preston and the Wireless Officer had rigged up a canvas shelter amidships, spreading the covering ridge-wise on a gantline stretched between the mainmast and the for'ard end of the hatch. The hatch was a large one, measuring roughly thirty feet by ten, and was covered with canvas held down by bamboo battens. This, with the tent, took up the greater part of the deck space amidships. Farther aft, but on the centre line, a tent made from the boat's mizzen sail had been set up for Olive's use. Provided the weather remained fairly quiet it formed quite a sheltered and comfortable retreat. The Arab captain had raised no objections to the execution of this plan, although it had been carried out without his sanction. Peter and Mahmed had set up the shelters without any hesitation. The former was, indeed, prepared to assert his right to do so in consideration of the fact that he had not pressed his claim for more accommodation under the poop-deck. It was late before Mostyn turned in. For quite an hour he had stood on deck with Olive, watching the moon sinking lower and lower in the heavens until it dipped beneath the horizon. Peter gave no hint to the girl of his misgivings, nor did Olive refer to her reasons for refusing to share the cabin with Mrs. Shallop. After all, knowing the lady, he was not surprised at the cultured girl's reluctance to be in her company more than was absolutely necessary. At about ten o'clock Peter bade the girl good night. Creeping in under the flap of his shelter he found Preston fast asleep on one side of the deck-space and Mahmed, equally somnolent, lying right across the entrance. He stirred as Peter made his way over him, but instantly fell asleep again. "Fortunately I'm not sleepy," thought Mostyn, as he settled himself upon his share of the rough bedding, which consisted of oilskin coats and a rafia mat. On deck all was quiet, save for the occasional creaking of the blocks and the ripple of water at the dhow's bows. With the exception of the helmsman the Arab crew had gone below before Peter had retired to his shelter-tent. The lascars had also retired to their assigned quarters for'ard. The night was calm and sultry. At twelve the solitary watch on deck was relieved; it apparently being the custom on board the dhow for the helmsmen to work three hour-tricks both by day and night. Peter heard the two men talking for a few minutes in a low tone; then the Arab off duty went below, his slippers pattering softly on the deck. Another hour passed. Nothing of an unusual nature happened. Mostyn began to wonder whether his precautions had been in vain. He was feeling a bit sleepy by this time, but he had no desire to arouse his injured companion. He was content to take Preston's word for the deed, but if he were to keep awake he simply must have some fresh air.