to search for gold in the caves of ice. They were almost defeated in their purpose by the actions of Andy Foger and his father, who, in an underhand manner, got possession of a valuable map, showing the location of the gold, and made a copy of the drawing.
Then, when Tom and his friends set off in the Red Cloud, as related in "Tom Swift in the Caves of Ice," the Fogers, in another airship, did likewise. But Tom and his party were first on the scene, and accomplished their purpose, though they had to fight the savage Indians. The airship was wrecked in a cave of ice, that collapsed on it, and the survivors had desperate work getting away from the frozen North.
Tom had been home all the following winter and spring, and he had done little more than work on some small inventions, when a new turn was given his thoughts and energies by a visit from Mr. Gunmore, as narrated in the first chapter of the present volume.
"Well, I guess no one is here," remarked the young inventor as he completed the circuit of the grounds and walked slowly back toward the house. "I think I scared Andy so that he won't come back right away. He had the laugh on me, though, when I stumbled and fell."
As Tom proceeded he heard some one ap-
