David Suchet stars as the Belgian detective, who is called on to investigate the murder of a woman on the Blue Train bound for the French Riviera.
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The impeccable Belgian detective tackles another case. At Richard Abernathie's funeral his niece, Cora, suggests he was probably murdered. The next day Cora is murdered herself. Poirot interrogates the family to find her killer.
The host is murdered at a bridge party. Poirot uses psychology and the bridge scores to find the killer, and discovers that four guests have murdered before.
When a stranger is found murdered at Warmsley Vale, the Cloade family ask for Poirot's help to find out if the dead man was Rosaleen Cloade's first husband.