to have a look." And Tom jumped from the library window and ran down
the path after the unknown thief.

Chapter Four

Anxious Days

Peering on all sides as he dashed along the gravel walk, hoping to
catch a glimpse of the unknown intruder in the garden or shrubbery, Tom
sprinted on at top speed. Now and then he paused to listen, but no
sound came to him to tell of some one in retreat before him. There was
only Silence.

"Mighty queer," mused the youth. "Whoever it was, he couldn't have had
more than a minute start of me--no, not even half a minute--and yet
they've disappeared as completely as though the ground had opened and
let them down; and the worst of it is, that they've taken my plans with
them!"

He turned about and retraced his steps, making a careful search. He saw
no one, until, turning a corner, a little later, he met Eradicate
Sampson.

"You haven't seen any strangers around here just now, have you, Rad?"
asked Tom anxiously.

"No, indeedy, I hasn't, Massa Tom. What fo' kind ob a stranger was him?"

"That's just what I don't know. Rad. But some one sneaked into the
library lust now and took some of my plans while my father dozed off. I
jumped out after him as soon as I could, but he has disappeared."

"Maybe it were th' man who done stowed hisself away on yo' airship, de
time yo' all went after de diamonds," suggested the colored man.

"No, it couldn't have been him. If it was anybody, it was Andy Foger,
or some of his crowd. You didn't see Andy, did you, Rad?"

"No, indeedy; but if I do, I suah will turn mah mule, Boomerang, loose
on him, an' he won't take any mo' plans--not right off, Massa Tom."

"No, I guess not. Well, I must get back to dad, or he'll worry. Keep
your eyes open, Rad, and if you see Andy Foger, or any one else, around
here, let me know. Just sing out for all you're worth."

"Shall I call out, Massa Tom, ef I sees dat blessin' man?"

"You mean Mr. Damon?"

"Dat's de one. De gen'man what's allers a-blessin' ob hisself or his
shoelaces, or suffin laik dat. Shall I sing out ef I sees him?"

"Well, no; not exactly, Rad. Just show Mr. Damon up to the house. I'd
be glad to see him again, though I don't fancy he'll call. He's off on
a little trip, and won't be back for a week. But watch out, Rad." And
with that Tom turned toward the house, shaking his head over the puzzle
of the missing plans.

"Did you find any one?" asked his father eagerly as the young inventor
e