The Lost Ambassador by E. Phillips Oppenheim

I was awakened about midday by the _valet de chambre_, who informed me that a gentleman was waiting below to see me -- a gentleman who had given the name of Monsieur Louis. I ordered him to prepare my bath and bring my coffee. When Louis was shown upstairs I was seated on the edge of my bed in my dressing-gown, smoking my first cigarette.

Louis had the appearance of a man who had not slept. As for myself, I had never opened my eyes from the moment when my head had touched the pillow. I had no nerves, and I had done nothing which I regretted. I fancy, therefore, that my general appearance and reception of him somewhat astonished my early visitor. He seemed, indeed, to take my nonchalance almost as an affront, and he proceeded at once to try and disturb it.