Three bodies are found. Beside each lies a copy of the ABC Railway Guide. The police are baffled. But the killer has made one mistake. He has challenged Hercule Poirot to unmask him.

The episode was rated 8.05 from 172 votes.

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?

The episode was rated 8.05 from 139 votes.

After collapsing in front of his 'rival' Japp, being rushed into hospital and diagnosed with a weight problem that could cause a heart problem, private society detective Hercule Poirot, who must recover and hopes to lose some weight, visits a seaside health farm on "Burgh Island", in Devon, which has about the best weather in Britain, accompanied by his British friend and assistant, major Hastings. For once he needs to keep far from mysteries, but a murder happens right there: the flirtatious heiress Arlena Stewart is found strangled on a secluded beach where she went sunbathing near a cove. As usual Poirot has screens several suspects such as Christine Redfern, whose husband, journalist Patrick Redfern, was flirting with Arlena in front of Christine while Arlena's husband Kenneth Marshall and 17-year-old step son Lionel Marshall resented her own flirtations with other men. Others had much to loose by Arlena's diva-bitching in professional life. A strange guest at the resort, Major Barry, rather grimly warns Poirot and Hastings to leave as the island isn't a safe place but refuses to explain why. The mystery unravels slowly as he struggles with the exact method of the killer(s?) and especially the timing of events, for both deliberate deception and chance complicated matters.

The episode was rated 8.05 from 147 votes.

Living quietly in the small village of King's Abbot, sleuth Hercule Poirot becomes involved in the murder of successful industrialist Roger Ackroyd. The number of potential killers is almost as great as the population of the village itself. As Poirot investigates he sees that there might be a connection to the suicide of a local woman, and the death the previous year of her husband.

The episode was rated 8.06 from 143 votes.

Ariadne Oliver is asked to devise a murder hunt for a Devon fête, but her sense of foreboding summons Poirot to the scene. Her fears are realized when, during the fête, the girl playing her murder victim winds up well and truly murdered.

The episode was rated 8.07 from 169 votes.

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.

The episode was rated 8.09 from 155 votes.

As a deadly game of chess unfolds in the wake of World War II, Russian grandmaster Dr Ivan Savaranoff meets a shocking end, sending the public spiraling into panic, as suspicion is cast upon Peace Party stalwarts Abe Ryland and Madame Olivier. In one of his toughest challenges yet, Poirot must work out who the villains are from the good people, as a complex plot sees a host of international figures used like pawns by a gang of dangerous dissidents tagged "The Big Four." As the murders and disappearances stack up one by one, Poirot is joined in his investigations by his old friend Japp, the dogged journalist Tysoe, and struggling actress Flossie Monro, in an attempt to snare the killer and shatter "The Big Four" for good.

The episode was rated 8.16 from 180 votes.

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.

The episode was rated 8.16 from 142 votes.

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.

The episode was rated 8.17 from 148 votes.

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?

The episode was rated 8.25 from 157 votes.

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.

The episode was rated 8.26 from 161 votes.

The sleuth falls victim to depression after failing to prevent the murder of a society girl by notorious art thief Marrascaud. His confidence shattered, Poirot eventually returns to work when a lonely chauffeur begs him to find his missing soulmate, the maid of a famous Russian dancer. The investigation takes him to the Swiss Alps, where, against all odds, he stumbles upon a hotel thought to be Marrascaud's hideout - leading to a very personal showdown.

The episode was rated 8.38 from 162 votes.

Investigating a spy-ring Colin Race comes to Wilbraham Crescent, where he literally bumps into agency typist Sheila Webb, as she comes flying out of number 19, the home of blind ex-teacher Millicent Pebmarsh. Sheila has discovered the body of a man whose identity proves hard to confirm, surrounded by four clocks, stopped at the same time. Miss Pebmarsh does not know the man and did not ask for the services of Sheila, who is the initial chief suspect. However, as Poirot is brought in to assist Inspector Hardcastle in the case, and the murderer strikes again, Poirot comes to realise that the man was killed elsewhere and brought to Miss Pebmarsh's house. The neighbours claim to have seen nothing but Poirot believes one of them may have had a secret which was worth killing for and sets out to unmask them, as well as explaining the significance, if any, of the clocks. At the same time Colin solves his investigation but with mixed results.

The episode was rated 8.40 from 117 votes.

Poirot investigates the murder of a shady American business man stabbed in his compartment on the Orient Express, blocked by a blizzard in the Serbian mountains.

The episode was rated 8.44 from 142 votes.

In the post-war climate of the late 1940s, an ailing Poirot reunites with his old friend Captain Hastings at Styles Court, the place where they had solved their first murder together almost thirty years previously. Styles is now a modest guest house run by an elderly couple, and Poirot knows that one of the guests staying there is a heartless serial killer. The suspects range from a chemist and his invalid wife, a dashing but untrustworthy major, a charming aristocrat, a melancholic middle-aged woman, an unobtrusive birdwatcher, and Hastings' own feisty daughter. With Hastings' assistance, an incapacitated Poirot tries to prevent another murder from occurring, knowing that his own end is nearing.

The episode was rated 8.82 from 148 votes.