'Kindly tear that note up, Graham. Come, you are keeping us waiting.'

As the hero of the novel says, further concealment was useless. Tony
tore the note up unread.

'Hope it didn't want an answer,' he said to Jim after school. 'Constant
practice has made Thompson a sort of amateur lynx.'

'No. It was only to ask you to be in the study directly after lunch.
There's a most unholy row going to occur shortly, as far as I can see.'

'What, about this burglary business?'

'Yes. Haven't time to tell you now. See you after lunch.'

After lunch, having closed the study door, Jim embarked on the
following statement.

It appeared that on the previous night he had left a book of notes,
which were of absolutely vital importance for the examination which the
Sixth had been doing in the earlier part of the morning, in the
identical room in which the prizes had been placed. Or rather, he had
left it there several days before, and had not needed it till that
night. At half-past six the Pavilion had been locked up, and Biffen,
the ground-man, had taken the key away with him, and it was only after
tea had been consumed and the evening paper read, that Jim, thinking it
about time to begin work, had discovered his loss. This was about
half-past seven.

Being a House-prefect, Jim did not attend preparation in the Great Hall