The Man in the Brown Suit by Agatha Christie

Everybody has been at me, right and left, to write this story from the great (represented by Lord Nasby) to the small (represented by our late maid of all work, Emily, whom I saw when I was last in England. "Lor', miss, what a beyewtiful book you might make out of it all-just like the pictures!").

I'll admit that I've certain qualifications for the task. I was mixed up in the affair from the very beginning, I was in the thick of it all through, and I was triumphantly "in at the death." Very fortunately, too, the gaps that I cannot supply from my own knowledge are amply covered by Sir Eustace Pedler's diary, of which he has kindly begged me to make use.