“We can go farther than that,” went on Dunk. “We can leave some marked money on our table, leave our door open and see what happens.”

“It sounds sort of mean,” spoke Andy, doubtfully; “but I suppose if we have to have a trap that would be the best way to do it.”

“Then let’s get busy,” suggested Dunk. “He may not come to-night after all. We may have to watch for several nights. Meanwhile we’d better telephone the lawyer that we’re on a new lead.”

This was done, and the man in charge of Link’s case agreed to see Andy and Dunk early the next day to learn what success they had.

Then the trap was laid. The two who were doing this, not so much to prove Mortimer guilty as to free Link and others upon whom suspicion had fallen, went about their work.

As Dunk had surmised, Wright Hall was almost deserted. They found a hiding place in the lower corridor where they could see whoever came in. Their own door they left ajar, with a light burning. On the table where they had been put, as if dropped by accident, were a couple of marked bills.

“If he takes those, we’ll have him with the goods,” said Dunk, grimly.

Then he and Andy began their vigil.