"The old baggage isn't worth saving, but I suppose we shall have to try what we can do," Miles answered, then shouted to Katherine to look out.

The warning came only just in time, for at that moment the huge block of ice which had struck the house before came swirling round in their direction, and they had to dodge it as best they could.

"We must get round to the front, if we can," said Katherine, when they had got the boat safely away from the danger of collision with the ice.

"Not possible; look there!" shouted Miles excitedly, as a great sheet of ice came gaily floating on the swift current, caught against the corner of the house, and stuck there, banging, grinding, and jarring with the movements of the swirling water, and threatening to beat the house down like a battering ram. At the same moment they heard a cry for help from inside the house, and the woman on the far bank shouted and gesticulated more wildly than before, while the whole structure groaned and shivered like a creature in pain.

Katherine turned pale, but seized the oars resolutely. "There is only one thing to do, Miles, and I am going to do it. Can you hold the boat at the edge of the ice for five or ten minutes?"

"You are not going to get on to the ice?" he protested, his voice sharp with dismay, as he looked at the bowing, bobbing fragment many square yards in extent, which was grinding against the side of the house, but which might split into fragments at any moment.

"Yes, I am. Then I shall creep round to the front, so that Oily Dave can see me, and then, perhaps, his courage will be equal to coming outside," she said, standing up and throwing off her thick coat, for it would not do to be encumbered with much clothing when any moment might plunge her into the water.

"Katherine, don't go. It is an awful risk, and the old man isn't worth it!" pleaded Miles, and, despite the fact of his being a boy, there were actual tears in his eyes as he urged her not to go.

But she would not listen, calling out sharply: "Bump her against the ice and then I'll spring."

Putting out his strength, Miles brought the boat with a bang against the floating ice island, and at the same moment Katherine sprang lightly from the boat. But, despite her care, she landed on all-fours, and, as the ice was awash, got rather wet in the process. Rising to an erect position after a few preliminary staggers, she walked cautiously out towards the middle of the ice island, which would bring her within sight of the prisoner in the hut, and would, she hoped, inspire him with sufficient courage to help him in the task of getting him into the boat.