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. The character Colonel Race is introduced in this novel. Anne Beddingfeld is on her own and ready for adventures when one comes her way. She sees a man die in a tube station and picks up a piece of paper dropped nearby. The message on the paper leads her to South Africa as she fits more pieces of the puzzle together about the death she witnessed.
There is a murder in England the next day, and the murderer attempts to kill her on the ship en route to Cape Town. Nadina, a dancer in Paris, receives a visit from Count Sergius Paulovitch. Both are in the service of "the Colonel", an international agent provocateur and criminal. "The Colonel" is retiring, leaving his agents high and dry. Nadina has a plan to blackmail the Colonel. Anne Beddingfeld is an orphan after the sudden death of her archaeologist father.
Longing for adventure, she jumps at the chance live in London. Returning from an unsuccessful job interview, Anne is at Hyde Park Corner tube station when a man falls onto the live track, dying instantly. A doctor examines the man, pronounces him dead.