he did there Andy
and Dunk could not see, but he remained but a few minutes, and came out,
softly closing the door after him.

"I wonder what he got?" whispered Dunk.

"We'll soon know," was Andy's answer.

Mortimer went softly down the corridor. He did not try every door, but
only went in certain rooms, and these, the two watchers noticed, were
those where well-to-do students lived.

Mortimer made four or five visits, and then moved towards the apartment
of Andy and Dunk.

"It's our turn now," whispered the latter.

Silently they turned a corner, just in time to see Mortimer enter their
room.

"Now we've got him!" exulted Andy.

"Not yet; we've got to nab him," whispered Dunk. "Oh, Andy, this is
fierce! To think that we're spying on a Yale man! To think that a Yale
man should turn out to be a common thief! It makes me sick!"

"Same here," sighed Andy. "But the only way to stop suspicion from
falling on others is to get Mortimer with the goods. We've got to save
Link, too."

"That's right," assented Dunk. "He isn't a Yale man, but he's a heap
better than the kind in there." He nodded his head in the direction of
their room, where Mortimer now was.

They had left a light burning, and could see, as its beams were cut off
now and then, that the intruder was moving about in their apartment.

"Come on, let's get him--and have it over with," suggested Dunk.

"No, we've got to get the goods on him," said Andy.

"Well, hasn't he got plenty of stolen goods--those from the other
fellows' rooms?"

"I know. But if we went in on him now he'd bluff it off--say he came in
to borrow a book--or money maybe."

"But we could search him."

"You can't search a fellow for coming to borrow something," declared
Andy. "Come on, let's go where we can look in."

Silently they stole forward until they were opposite their door. From
it they had a good view of Mortimer.

Just at that moment they saw him reach for the bills on the table and,
with a quick motion, pocket them. Then the thief started toward a
bureau.

"Come on!" whispered Andy, hoarsely. "We've got to get him now, Dunk!"

With beating hearts the two sped silently but swiftly into the room.
They fairly leaped for Mortimer, who turned like a flash, glaring at
them. Fear was in his startled eyes--fear and shame. Then in an instant
he determined to face it out.

"We--we've got you!" cried Dunk, exultantly.

"Got me? I don't know what you mean?" said Mortimer,