“It will be much less muddling if you do, Mr. Alleyn.”

“It will, won’t it? Did you hear this call?”

“Oh, yes. Gabriel, my brother-in-law, always shouted like that for people.”

“Where were you, please?”

“In my bedroom.”

Alleyn glanced at his note-book.

“I’ve made a very rough sketch plan of both flats,” he said. “Your room is the second from the lift end of No. 26?”

“Yes.”

“Were you alone?”

“When he shouted? No. My sister-in-law and — Good heavens, Charlie, for pity’s sake—”