"قتل در قطار سریع‌السیر شرق" (Murder on the East Express Train) is a mystery novel written by Agatha Christie. It features the famous detective Hercule Poirot, who investigates a murder that occurs on a luxurious train traveling through Europe. The story unfolds as Poirot interviews the passengers, each with their own secrets and motives. The plot thickens as Poirot uncovers clues and contradictions among the passengers. The novel explores themes of justice, deception, and the complexity of human nature. Ultimately, Poirot reveals the surprising truth behind the murder, showcasing Christie's signature twist ending.