“Oh, Allan!” she exclaimed, and started up. “Why didn't you waken me before? What is it? What can I do to help?”

“I think there's rough water ahead, dear,” the engineer answered, trying to steady his voice, which shook a trifle in spite of him. “At any rate, it sounds like a waterfall of some kind or other; and see, there's a line, a drift of vapor rising over there. We're being carried toward it on a strong current.”

Anxiously she peered, now full awake. Then she turned to Allan.

“Can't we sail away?”

“Not enough wind. We might possibly row out of the current, and--and perhaps--”

“Give me one of the sweeps quick, quick!”

He put the sweeps out. No sooner had he braced himself against a rib of the yawl and thrown his muscles against the heavy bar than she, too, was pulling hard.

“Not too strong at first, dear,” he cautioned. “Don't use up all your strength in the first few minutes. We may have a long fight for it!”

“I'm in it with you--till the end--whichever way it ends,” she answered; and in the moonlight he saw the untrammeled swing and play of her magnificent body.

The yawl came round slowly till it was crosswise to the current, headed toward the mainland shore. Now it began to make a little headway. But the breeze slightly impeded it.