The adventures of Agatha Christie's famous Belgian detective, Hercule Poirot, adapted for television over more than twenty years and covering every Poirot book and short story ever written. This enormous lifelong project starring David Suchet takes the eponymous detective from England to Egypt, from country estate to weekend lodge, from dinner party to train ride, with his good friend Captain Hastings at his side, solving some of the most celebrated murder mysteries ever conceived.
Sixteen years earlier, Caroline Crale was charged with killing her husband, Amyas Crale, and no one doubted her guilt. The case was closed after she was duly tried, convicted and hanged. But then, in the present day, their daughter Lucy Crale returns from Canada after reading a letter written by Caroline before her death, in which she claims to be innocent. Anxious to know the truth, Lucy hires Poirot to solve the murder of her father sixteen years before. Poirot visits the five people present on the fateful day, all of whom may be possible suspects. The late Amyas was well known for having affairs with his models. Does Elsa Greer, his lover at the time of his death, hold the key to unravelling the case?
Young Elinor Carlisle, engaged to marry the dashing Roddy Winter, finds herself charged with the fatal poisoning of Mary Gerrard, her rival in love. Poirot has the job of saving Elinor's skin, but unfortunately, the evidence against her is overwhelming. If Elinor has been framed, someone has been fiendishly clever.
While on their honeymoon in Egypt, newlyweds Simon Doyle and Linnet Ridgeway are constantly harassed by Simon's ex-fiancée Jacqueline de Bellefort who feels her ex-best friend has stolen the love of her life. A holidaying Hercule Poirot counsels Jacqueline to put an end to her antics, fearing that all of this can only end in tragedy. When one of the passengers is killed while on a cruise down the Nile, Poirot must sift through an odd assortment of passengers, all of whom may have something to hide. There is Linnet's financial advisor from the US, her French maid who clearly has something to hide, the Austrian doctor who keeps mostly to himself and the left leaning philosopher who despises the rich.
Poirot is spending a week-end with the Angkatells, at their country house called The Hollow. The good-looking Dr John Christow is also there, with his plain wife, but he is flirting (or perhaps more) with Henrietta Savernake, a young artist. Meanwhile, Lady Angkatell is match-making between Henrietta and Edward Angkatell, to the distress of Midge, who loves Edward.
Then a game of murder turns into the real thing, when Christow is shot dead by the swimming pool. Gerda Christow is found holding the gun, but was she set up? Sir Henry Angkatell asks Poirot (how could he do anything else?) to find the killer, and it soon appears that several of the house party had motives for killing Christow, including Henrietta and Lady Angkatell... then the ballistic evidence comes in, and there is a big surprise.
Poirot will surely outwit the murderer. Or will he?