“This is getting very involved,” said Jimmy.

“ Mr. Thesiger, when you came into this room, did you switch on the light at all?”

“Yes.”

“And there was no one in the room?”

“No one at all.”

“But previously you thought you heard someone moving about down here?”

“Yes.”

“And then, after trying the window, you switched off the light again and locked the door?”

Jimmy nodded.