d you don't know who
it's from?" asked Andy, in surprise.

"That's right!" exclaimed Link, with a laugh. "I wish I did know, for
I'd write and thank whoever it was. It surely came in handy."

"Why, it's very strange," spoke Andy, slowly. "Could you tell by the
postmark where the letter came from?"

"It was from New York, but I haven't a friend there that I know of."

"Well, I'm glad you've got it. Take care of it, Link."

"I intend to. I can lend you some now, if you need it, Mr. Blair."

"Thank you, I have enough at present."

Andy watched his protege walk across the campus, and near the middle
observed him stopped by a stranger. Link appeared surprised, and started
back. There was a quick movement, and the young farmer was seized by the
other.

"That's queer!" exclaimed Andy. "I wonder what's up? Link may be in
trouble. Maybe that fellow's trying to rob him."

The quadrangle was almost deserted at the time. Andy hurried down and
ran over to where Link was standing. The student caught the gleam of
something on the wrist of his friend. It was a steel handcuff!

"What--what's up, Link?" Andy gasped.

"Why, Mr. Blair--I don't know. This man--he says he's a detective,
and----"

"So I am a detective, and I don't want any of your funny work!" was the
snappish retort. "There's my badge," and it was flashed from under the
armhole of the man's vest, being fastened to his suspenders, where most
plain-clothes men carry their official emblem.

"A detective!" gasped Andy. "What's the matter? Why do you want Link
Bardon?"

"We want him because he's accused of being the quadrangle thief!" was
the unexpected answer. "Stand aside now, I'm going to take him to the
station house!"

CHAPTER XXX

THE LETTER

Andy could scarcely understand it. Surely, he thought, there must be
some mistake. He was glad there was not a crowd of students about to
witness the humiliation of Link--a humiliation none the less acute if
the charge was groundless.

"Wait a minute--hold on!" exclaimed Andy, sharply, and there was
something in his voice that caused the detective to pause.

"Well, what is it?" the officer growled. "I haven't any time to waste."

"Do you really want him on a robbery charge?" asked Andy.

"I do--if his name is Link Bardon," was the cool answer. "I guess he
won't attempt to deny it. I've been on his trail for some time."

"That's my name, sure enough--I have no reason to deny it," said Link,
who had t