"Why, it's a _boy_, don't you see, and he must have left that window
unlatched on purpose this afternoon when some of the fellows were
shutting up.

"Wait and see," advised Hugh, although almost convinced of the same
thing himself.

The test was not long in coming. They could see the other "shinning"
up the sloping plank, as any athletic boy would be apt to do, without
any particular trouble. Now he had reached the window, and Thad held
his breath in suspense. He sighed as he heard a slight squeaking
sound. Evidently the sash which was supposed to be fastened every
night through ordinary prudence, had given way to his hand, when he
exerted some pressure.

"He's going in, Hugh!" Thad observed, again laying a quivering hand
on the arm of his comrade, and then following these words with a low
exclamation of startled wonder: "Oh! look there, what's that queer
glow mean?"

Hugh understood readily enough.

"Why, he's got one of those little handy electric torches, you see,
and is using it so as to get his bearings inside the building."

"Guess you're right, Hugh," admitted the other; "and there, he's
crawling over the sill now, as sure as anything. Oh! the skunk,
what can he be up to?"