I can't understand it at all.

I've never been in the tower since I've been in school." "Do you know of any one who might like to get you into trouble in such a way as this ?" "No, sir," answered Joel promptly.

Then a sudden recollection of Bartlett Cloud came to him, and he hesitated.

Professor Durkee observed it.
"Well ?" he said sharply.
"I know of no one, sir." "Humph!" grunted the professor, "you do, but you won't say." "If you suspect any one it will be best to tell us, March," said Professor Wheeler, more kindly.

"You must see that the evidence is much against you, and, while I myself can not believe that you are guilty, I shall be obliged to consider you so until proof of your innocence is forthcoming.