Both their heads were framed in the window as the train glided out of the station.

That night I once more roamed restlessly from room to room of my house. The place seemed extraordinarily and insistently empty, and I could not have told you whether I was glad or sorry for it. For this thing was getting altogether too much for me. Remember that I am merely a commercially successful English novelist, not a person accustomed to the contemplation of the mysteries of life and death in terms of electric torches and bamboo tables. Also a man of my years does not spend a night at the Devil's Punch Bowl without knowing something about it afterwards. In this connection, going into my dressing-room, I found that after all my suit of clothes had not been brushed. I summoned Mrs Moxon and told her to take them away. She stiffened a little, and some part of her clothing creaked.

"It's made a good deal of extra work for the week-end," she reminded me.

"I'm sorry for that, but you were consulted beforehand," I said.

"It was more than I reckoned for," she announced with dignity.

A little of this was enough.

"Very well, Mrs Moxon. Take the clothes away, please, and let me have them to-morrow. By the way, I shall be going up to town by the midday train."

"In that case, sir," she said, "if you're seeing Mr Rose perhaps you'd give him this. I suppose it's his. I found it in his room."

She put into my hand a small book covered with shiny black cloth. I opened it to see what it was.

A single glance told me. It was Derwent Rose's diary.