of that spy business!"

Tom Swift stopped the tank and prepared to get out.

Chapter XVI

The Old Barn

"There's no use chasing after 'em, Tom," observed Ned, as the two chums
stood side by side outside the tank and gazed after the three men
running off across the fields as fast as they could go. "They've got
too much a start of us."

"I guess you're right, Ned," agreed Tom. "And we can't very well pursue
them in the tank. She goes a bit faster than anything of her build, but
a running man is more than a match for her in a short distance. If I
had the Hawk here, there'd be a different story to tell."

"Well, seeing that you haven't," replied Ned, "suppose we let them
go--which we'll have to, whether we want to or not--and see where they
were hiding and if they left any traces behind."

"That's a good idea," returned Tom.

The place whence the men had emerged was a portion of the old factory
farthest removed from the walls the tank had crunched its way through.
Consequently, that part was the least damaged.

Tom and Ned came to what seemed to have been the office of the building
when the factory was in operation. A door, from which most of the glass
had been broken, hung on one hinge, and, pushing this open, the two
chums found themselves in a room that bore evidences of having been the
bookkeeper's department. There were the remains of cabinet files, and a
broken letter press, while in one corner stood a safe.

"Maybe they were cracking that," said Ned.

"They were wasting their time if they were," observed Tom, "for the
combination is broken--any one can open it," and he demonstrated this
by swinging back one of the heavy doors.

A quantity of papers fell out, or what had been papers, for they were
now torn and the edges charred, as if by some recent fire.

"They were burning these!" cried Ned. "You can smell the smoke yet.
They came here to destroy some papers, and we surprised them!"

"I believe you're right," agreed Tom. "The ashes are still warm." And
he tested them with his hand. "They wanted to destroy something, and
when they found we were here they clapped the blazing stuff into the
safe, thinking it would burn there.

"But the closing of the doors cut off the supply of air and the fire
smouldered and went out. It burned enough so that it didn't leave us
very much in the way of evidence, though," went on Tom ruefully, as he
poked among the charred scraps.

"Maybe you can read some o