The master of crime fiction weaves a tale of suspense beginning with a clandestine meeting in Paris and a stolen fortune in priceless rubies, the historic Heart of Fire. American millionaire Rufus Van Aldin attempts to rescue his daughter Ruth from a disastrous marriage to the charming but bankrupt Derek Kettering. Urged by her father to seek a divorce, Ruth embarks on a fateful journey southward aboard the famous Blue Train. Unbeknownst to her, several individuals with overlapping motives and shadowy pasts share the same route through France.
During the night, amidst the clatter of the speeding carriages, a terrible crime is committed. Ruth Kettering is found strangled in her compartment, and her famous rubies have vanished without a trace. When Hercule Poirot steps in to untangle the threads of the mystery, he finds himself facing a labyrinth of alibis, false leads, and conflicting testimonies.
As suspicion naturally falls upon the victim's estranged husband, Poirot digs deeper into the complex relationships connecting the passengers. The investigation reveals that multiple people had access to the compartment, each harboring secrets and desperate desires. The clever detective must sift through layers of deceit, navigating the glamorous yet treacherous world of international travel. With the true nature of the crime gradually coming to light, Poirot must unmask a cunning killer before more lives are endangered.
