She could not leave Uncle George, who was raving wildly, and yet it was necessary to obtain assistance somehow. Suddenly she remembered the distress signal. She must hoist it. How fortunate that Uncle George had once shown her how! Ten minutes later there was a commotion over at Harbour Head where the signal was promptly observed, and very soon--although it seemed long enough to Mary Margaret--a boat came sailing over to the Big Dipper. When the men landed they were met by a very white-faced little girl who gasped out a rather disjointed story of a light that hadn't been lighted and an uncle with a broken leg and a sister tied in her chair, and would they please see to Uncle George at once, for she must go straight over to the other Dipper? One of the men rowed her over, but before they were halfway there another boat went sailing across the harbour, and Mary Margaret saw a woman and two men land from it and hurry up to the house. That is Mother and Uncle Martin, but who can the other man be? wondered Mary Margaret. When she reached the cottage her mother and Uncle Martin were reading her note, and Nellie, just untied from the chair where she had been found fast asleep, was in the arms of a great, big, brown, bewhiskered man. Mary Margaret just gave one look at the man. Then she flew across the room with a cry of delight. "Father!" For ten minutes not one intelligible word was said, what with laughing and crying and kissing. Mary Margaret was the first to recover herself and say briskly, "Now, _do_ explain, somebody. Tell me how it all happened." "Martin and I got back to Harbour Head too late last night to cross over," said her mother. "It would have been madness to try to cross in the storm, although I was nearly wild thinking of you two children. It's well I didn't know the whole truth or I'd have been simply frantic. We stayed at the Head all night, and first thing this morning came your father." "We came in last night," said Captain Campbell, "and it was pitch dark, not a light to be seen and beginning to snow. We didn't know where we were and I was terribly worried, when all at once the Big Dipper light I'd been looking for so vainly flashed out, and everything was all right in a moment. But, Mary Margaret, if that light hadn't appeared, we'd never have got in past the reefs. You've saved your father's ship and all the lives in her, my brave little girl." "Oh!" Mary Margaret drew a long breath and her eyes were starry with tears of happiness. "Oh, I'm so thankful I went over. And I _had_ to tie Nellie in her chair, Mother, there was no other way. Uncle George broke his leg and is very sick this morning, and there's no breakfast ready for anyone and the fire black out ... but that doesn't matter when Father is safe ... and oh, I'm so tired!"