"I wonder if they've gone away?" thought Tom. "I can't hear any noise."
He listened intently. It was dark and silent in the shop. Suddenly the light flashed up brighter than before, and the young inventor caught sight of a man walking around the new aeroplane, examining it carefully. He carried, as Tom could see, a large-sized electric flash-lamp, with a brilliant tungsten filament, which gave a powerful light.
As the youth watched, he saw the intruder place the light on a bench, in such a position that the rays fell full upon the Humming-Bird. Then, adjusting the spring switch so that the light would continue to glow, the man stepped back and drew something from an inner pocket.
"I wonder what he's up to?" mused Tom. "I wish Eradicate and Mr. Jackson would hurry back. Who can that fellow be, I wonder? I've never seen him before, as far as I know. I thought sure it was going to turn out to be Andy Foger!"
Tom turned around to look into the dark yard surrounding the shed. He was anxious to hear the approach of his two allies, but there was no sound of their footsteps.
As he turned back to watch the man he could not repress a cry of alarm, for what the intruder
