“We must set a trap,” suggested Dunk.

“A trap?”

“Yes, do something to catch this mean thief—Mortimer or whoever he is—in the act.”

“Hadn’t we better tell the Dean—or someone.”

“No,” said Dunk, after thinking over the matter. “Let’s see if we can’t do this on our own hook. Then if we make a mistake we won’t be laughed at.”

“But when can we do it?” Andy asked.

“This very night. It couldn’t happen better. Nearly all the fellows will be out of Wright Hall in a little while. We’re booked to go, and Mortimer knows it, for I was making arrangements with Bert Foley about our seats, and Mortimer was standing near me. He came to borrow ten dollars, but I didn’t let him have it. So he will be sure to figure that we’ll be out to-night.”

“But how do you know he’ll come to our room?”

“I don’t know it. I’ve got to take a chance there. But we can hide down in the lower corridor, and watch to see if he comes in this dormitory. If he does, knowing that ’most all the fellows are out, it will look suspicious. We can watch for him to go out and then tackle him. If he has the goods on him the jig is up.”

“Well, I guess that is a good plan,” agreed Andy. “I hate to have to do it, but we owe it to ourselves, to the college and to poor Link to discover this thief. I only hope it doesn’t prove to be Mortimer, but it looks very bad for him.”