“Harry!” she cried, in delight, pressing his hand in genuine pleasure. It was he who had stood by her, believed in her, when nobody else but her chum, Louise Haydock, had thought she could fly the Atlantic Ocean. “Linda! It’s heaven to see you again!” he exclaimed. “Hello, Ralph,” he added, shaking hands with her escort. “How’s tricks with you?” “O.K., Harry. When’d you get here?” “Half an hour ago. By plane.” “You have a plane?” demanded Linda. “No—be yourself, Linda! I’m a poor working man. No, I came with Kit’s husband—Tom Hulbert. I have a couple of weeks’ vacation, and decided I’d like to spend them with the old crowd. I’m staying with the Hulberts.” Linking arms, all three entered the bungalow together, which was much larger and more luxurious than most of the cottages at Green Falls, for Kit’s wealthy father, Mr. Clavering, had presented the young couple with it soon after their marriage. A small orchestra of three pieces had been hired for the dancing, to take the place of the usual radio music, and the large living room was easily able to accommodate twice the number of couples Kit had invited. As Ralph had surmised, although there were only seven girls, five extra young men had been asked to the party. Tiny Kit Hulbert, dressed in a fairy-like dance costume of pale-green chiffon, floated over to greet the newcomers. “I hear you’ve had another adventure, Linda,” she said. So timid herself that she had given up learning to fly after a few feeble attempts, she nevertheless had a great admiration for the other girl’s skill and courage. “It isn’t finished yet,” replied Linda. “We’re in the middle of a mystery. I’ll tell you all about it, Kit, when Ralph isn’t around. He’s rather fed up.” “I’ll say I am. How soon can we dance, Sis?” asked the young man, impatiently. “Right away,” agreed Kit, nodding to the violinist in the corner to start the music. The supper, served informally on the big porch that evening, was early; for the Hulberts had an exciting piece of news for their guests, and they could hardly wait for the opportunity to tell it. As soon as everybody was seated, Tom Hulbert, who was a lieutenant in the U. S. Flying Corps, and an excellent pilot, called for attention. “Our next party is going to be a wow!” he began. “They always are,” interrupted Sue Emery, enthusiastically. Tom bowed. “Thank you, Miss Emery,” he said, formally. “But this is absolutely different—entirely new! Kit’s father is giving us a treasure hunt. By airplanes!” “Airplanes!” gasped everybody at once. Linda’s eyes shone with excitement. What a novel idea! “But most of us can’t go!” whined Sue Emery. “We’re not pilots!” “Sure you can. Mr. Clavering’s going to rent a lot of planes, so anybody with a pilot’s license to fly can enter, and take a passenger. And there’s a bully prize—Oh, I’m not going to tell what it is! And a dinner at the end of the hunt—maybe a week-end party!”