A classic detective mystery by Agatha Christie featuring the legendary Hercule Poirot. The story begins aboard the luxurious Blue Train traveling from Calais to the French Riviera. During the journey, a wealthy American heiress, Ruth Kettering, is found murdered in her compartment, and a priceless ruby known as the "Heart of Fire" has vanished.

As Poirot investigates, he uncovers a tangled web of greed, romance, jealousy, family intrigue, and deception. With numerous suspects and hidden motives, the case becomes one of his most challenging puzzles. Combining glamour, suspense, and masterful misdirection, The Mystery of the Blue Train is a captivating example of Christie's Golden Age detective fiction.