“My brother always went up to his room at eleven, unless we had visitors,” said Miss Matthews. “We were all brought up to keep regular hours in my family, though I must say Gregory used to waste a lot of time pottering about his room before he got into bed.”

“You don't know what he did after he went upstairs, or when he actually got into bed?”

Miss Matthews was inclined to be affronted.

“Certainly not! I was not in the habit of spying on him!”

“I wasn't suggesting anything like that, Miss Matthews,” replied Hannasyde peaceably. “You might have heard him moving about in his room.”

“Oh no, this house is very well built, and, besides, my room isn't next to his.”

“I see. Who did sleep next to Mr Matthews?”

“Well, my sister-in-law, in a way, but there's a bathroom in between,” explained Miss Matthews. Hannasyde looked at Guy. “At what hour did you go up to bed, Mr Matthews?”

“Haven't an idea,” said Guy carelessly. “Sometime between half-past eleven and twelve, I should think.”

“Did you notice whether the light was still on in your uncle's room?”