"Can't make that out," he was told.
"But what in the wide world is he trying to do?" pursued Thad, his curiosity now fully aroused, as the unknown again started to move forward, pursuing the same strange cautious tactics as before.
"That's what we ought to find out," Hugh told him. "I don't like the way he's sneaking around here. It looks as if he might be up to some game."
"Oh! perhaps it's a tramp," suggested Thad, as the idea dawned upon his brain.
"He may be meaning to break into the building, to sleep there to-night. I wouldn't put it past a hobo to steal anything he could find left in the lockers. Hugh, it's up to us to put a kink in his rope. Let's chase after him before he disappears."
CHAPTER VII
CAUGHT IN THE ACT
"Hold on, Thad," continued Hugh, as he put a restraining hand on the shoulder of his more impulsive chum, "we've got to be careful, or else he'll learn how we're meaning to spy on him. Bend over, and do the grand sneak act."
"He's headed straight for the building, Hugh!" breathed the other, as he complied with the directions given by the one whom he was accustomed to look upon in the light of a leader.
"That's right, and I guess he's meaning to crawl inside, if only he can find a window that's been left unfastened. Steady now, Thad; he's stopped under one right now!"