You can have Jervis's room, which he doesn't often use nowadays, and you will be more happy here than elsewhere, I know.

I may as well give you my latchkey now.

I have a duplicate upstairs, and you understand that my chambers are yours too from this moment." He handed me the latchkey and I thanked him warmly from my heart, for I felt sure that the suggestion was made, not for any use that I should be to him, but for my own peace of mind.

I had hardly finished speaking when a quick step on the paved walk caught my ear.
"Here is Jervis," said Thorndyke.

"We will let him know that there is a locum tenens ready to step into his shoes when he wants to be off." He flashed the lantern across the path, and a few moments later his junior stepped up briskly with a bundle of newspapers tucked under his arm.
It struck me that Jervis looked at me a little queerly when he recognised me in the dim light; also that he was a trifle constrained in his manner, as if my presence were an embarrassment.