Murder on the Orient Express is a detective novel by Agatha Christie that was first published in 1934. The novel features the Belgian detective Hercule Poirot and takes place on the Orient Express, a luxury train that was popular at the time.The story begins with Poirot being called to investigate a murder that took place on the Orient Express. The victim is an American businessman named Ratchett, who was stabbed to death in his sleep. Poirot is able to identify the killer, but is unable to bring them to justice.The novel is famous for its twist ending, which is still a mystery to many readers.