When night came Grani called Rolf and Frodi, and bade them watch by turns while he slept. "I will be a good master so long as ye serve me well." Rolf thought Grani to be about his age, yet not so old in mind. Much pleased was Grani to own thralls. He seemed kindly, but petulant and uncertain. CHAPTER XIX NOW MEN ARE SHIPWRECKED Those two ships sailed together, all that day; but in the night they became separated, for there was a little wind. In the morning Grani's ship was close to a shore, and that was the Mainland of Orkney. For miles great cliffs stood up out of the water, the wind fell, and there was a long ground-swell. Then said Grani: "Often have I seen these cliffs from above; now it will be sport to see them from below. Put in close, and sail along under the cliffs." Those two old men who had warded him in the fight both spoke to him, saying it were better to keep away. But Grani pouted and gave his order again. "All men say," quoth he, "that the water is deep there, and no harm can befall." Then they sailed along under the cliffs, and a grand sight that was, to see them high above and stretching far ahead. Rolf stood in the bow, and he looked first up at the cliffs, and then down into the green water. There came a great wave, larger than the others, and after it the water fell away. Just before the ship, Rolf saw a rock break the water with scarcely a ripple, for it was very sharp; sea-weed floated around its sides. Another wave came and lifted the ship up, and the rock disappeared as if it had sunk down. Rolf shouted in warning. But the wave passed, the ship rushed down into the hollow, and struck the rock. The planks tore apart beneath the bow, and all heard the splintering; then the water poured in, a wave lifted the ship, and she slid back into deep water. She began to sink. There was scarcely time to throw over oars and shields, and to leap after them into the water. The ship went down; the men were swimming, there under the wall of rock. They swam toward the cliff, and those who swam worst clung to the oars. But the cliff rose sharp from the water, only hand-hold was to be had, and the waves bruised the men as they tried to support themselves. Eighteen men in all were there, and they swam in a line along the cliff for an hour, until at last they found a foothold where a shelf of rock jutted under water, and all might stand waist deep. Then one of the men asked: "Is the tide coming or going?" They watched to find out, and at last it was sure: the tide was coming. It rose above their waists, so that the smaller men were lifted by the waves; and it was lucky that there was no storm, for they would all have been killed. Then the tide rose still higher, and men began to look anxious. There they stayed half an hour more, and the sea-otters swam about and looked at them. Frodi said to Rolf: "What dost thou think, and why look'st thou so at the cliffs above us?"