"The Mystery of the Blue Train" by Agatha Christie follows detective Hercule Poirot as he investigates the murder of Ruth Kettering, a wealthy American heiress, aboard the famous Blue Train traveling to the French Riviera. Ruth's priceless ruby, the "Heart of Fire," is stolen, and suspicion falls on her estranged husband, Derek Kettering. Poirot, who happened to be aboard the train, untangles a web of secrets involving a mysterious dancer, a loyal maid, and family tensions. With his brilliant deductive skills, Poirot reveals the shocking truth behind the murder and the missing jewel in this classic whodunit.
