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.
After traveling on the Blue Train from Calais to Nice, Hercule Poirot is pressed into service to help solve the murder of heiress Ruth Kettering who is found savagely beaten in her compartment. She was the daughter of wealthy industrialist Rufus Van Alden and very much wanted a divorce. Both her husband and her lover were on the train but she had changed rooms with another passenger, Katherine Grey, so the question naturally arises as to whether she was the intended victim. Grey may also have had enemies as she had recently inherited a very large sum of money and greedy relatives had suddenly taken a interest in her. When an attempt is subsequently made on Grey's life, this appears to the case but Poirot methodically sifts through all of the clues to determine the motive and identify the killer.
Hercule Poirot finds himself investigating the murder of his dinner host, Mr. Shaitana who was stabbed in the heart while his guests played bridge. There are 8 guests and Poirot finds himself in the company of three other investigators. The foursome interview each of the other guests in turn but make little headway until Poirot manages to reconstruct the various bridge hands played at the suspects' table. In doing so, he is able to identify one particular action that leads him to identify the killer.
His friend, solicitor Gilbert Entwhistle, asks Hercule Poirot to help solve a riddle and a murder. The riddle has to do with Richard Abernethie's will. It would seem that he changed his will immediately prior to his death, distributing all of his wealth equally among family members but excluding George Abernethie who, in all previous wills, had been the sole beneficiary. The two had supposedly argued recently, but Entwhistle suspects the new will may be a forgery. As for the murder, he would like Poirot to investigate the death of Cora Galaccio, who was violently beaten to death the day after Richard's funeral. She too had inherited from the suspect will, but are the two deaths and the will all part of a greater plot, or is there a simpler explanation?
Hercule Poirot finds himself trying to solve the mystery of the Cloade family. Rosaleen is the young widow of Gordon Cloade who was killed in a gas explosion in his London home. Rosaleen has inherited her late husband's substantial fortune and she and her brother David Hunter are refusing to share it with other members of Gordon Cloade's family. There have been persistent rumors that Rosaleen's first husband, an intrepid explorer, is still alive and as such would nullify her marriage to Gordon. What Poirot learns however is of a far greater deception that will alter everyone's perception of what they believe to their reality.