They clambered over the tree and started running with all their might in the direction of the blazing plane.

And while, with their hearts full of apprehension and their lungs strained almost to bursting, they are hastening to the rescue, it may be well for the benefit of those who have not read the preceding volumes of this series to tell who Tom Swift was and what had been his adventures up to the time this story opens.

Tom, now about twenty-one years old, lived in the town of Shopton, a small inland city on the shores of Lake Carlopa. His father was Barton Swift, an inventor of note. Tom had grown up among wholesome surroundings and developed into a clear-cut, athletic young fellow, a general favorite among his associates. He was frank, courageous and good-natured, never looking for trouble but never stepping aside when it turned up.

Tom may have inherited the inventive genius of his father, or it may have been the force of example, but from his earliest years he displayed a marvelous aptitude in all things scientific and mechanical. A mere glance at any mechanical contrivance, from a watch to a steam engine, generally sufficed to give him a pretty clear idea of its working. But this was not enough. He saw not only its good qualities, but also its defects, and his active mind busied itself at once in trying to devise improvements. His success in this had been phenomenal. From his first venture into the realm of invention described in the opening volume of the series, entitled “Tom, Swift and His Motor Cycle,” his progress had been rapid. His ambition grew from what it fed upon, and the improvements that he added to the motor cycle were duplicated by those described in later volumes bearing on airships, submarines, rifles, cameras, searchlights, cannon and a host of other things that became famous. His friends described him as a “wizard.” But Tom, who was as modest as he was ingenious, never thought of himself in that light. He was unspoiled by praise and kept on devoting himself to his chosen vocation. Like Alexander, he was always looking for new worlds to conquer.

The work that he had done naturally brought with it large financial rewards. His activities resulted in the formation of the Swift Construction Company, which, starting on a small scale, had attained great proportions and formed the leading industry of the town of Shopton. In the development of the business Tom had been greatly aided by the financial ability of Ned Newton, his closest friend. Ned had been a clerk in one of the Shopton banks, but had left this position to become treasurer of the Swift concern. He was a genius in business management, and Tom was able with an easy mind to leave all financial details to Ned while he devoted himself to his inventions. It was an ideal combination. They were fortunate, too, in having at the head of the mechanical department Garret Jackson, a thorough mechanic himself and skilled in handling the large body of workmen on the Swift payroll.

Tom did not care overmuch for money, but of course he was glad that the business was prospering, especially as at the present time he was deeply interested in a charming young lady, Miss Mary Nestor. The attachment between them had grown rapidly of late and had been increased on Mary’s part by a great service that Tom had recently done in rescuing her father from an iceberg, on which he had been marooned while in a search for health. What peril was involved in that rescue and how Tom’s courage and ingenuity prevailed, are thrillingly told in the preceding volume of this series entitled: “Tom Swift and His Flying Boat; or, The Castaways of the Giant Iceberg.”

Now to return to the three who were hastening in the direction of the burning plane.

It must be confessed that they had little hope of being of use. The chances were great that the aviator had not survived the fall. Still, there was a chance, and that thought added wings to their feet as they tore through the forest.

Tom was first on the scene, with Ned close at his heels and Jackson bringing up the rear.

Resting on two trees was most of what remained of the doomed plane. It was still blazing so fiercely that they could not approach it closely. The motor had fallen through the trees to the ground, together with part of the wreckage of the plane.