"Want to have another go at it?" asked Andy, as he began to undress in earnest now.
"No, I guess we've had enough for one night. I say though—"
Frank paused with the sentence unfinished for there came another knock at the door. The two brothers looked at each other with startled faces. Who could it be this time?
CHAPTER V
A BULLY DEFIED
"Why don't you answer the knock, Andy?" whispered Frank, after a pause.
"Why don't you go yourself? I'm going to hop into bed again. You douse the glim. You're nearer to it than I am."
Andy crossed the room on tiptoe, and Frank was just reaching up to the gas. They both thought Professor Callum had returned, thinking to catch them. Such things had been known to happen among students.
The knock was repeated, but this time it was given in a peculiar manner. There were two light taps, a pause, then a heavy tap, then three light ones.
"That's no professor rapping," whispered Andy.