Agatha Christie 
The Man in the Brown Suit 

The Man in the Brown Suit is a work of detective fiction by British writer Agatha Christie, first published in the UK by The Bodley Head on 22 August 1924 and in the US by Dodd, Mead and Company later in the same year. The UK edition retailed at seven shillings and sixpence and the US edition at $2.00. Newly-orphaned Anne Beddingfeld is a nice English girl looking for a bit of adventure in London. But she stumbles upon more than she bargained for! Anne is on the platform at Hyde Park Corner tube station when a man falls onto the live track, dying instantly. A doctor examines the man, pronounces him dead, and leaves, dropping a note on his way. Anne picks up the note, which reads ‘17.1 22 Kilmorden Castle’.