The Mystery of the Blue Train is a mystery novel by British writer Agatha Christie, first published in the United Kingdom by William Collins & Sons on 29 March 1928The Observer, 25 March 1928 (p. 11) and in the United States by Dodd, Mead and Company later in the same year. The UK edition retailed at seven shillings and sixpence (7/6)The English Catalogue of Books. Vol XII (A-L: January 1926 – December 1930). Kraus Reprint Corporation, Millwood, New York, 1979 (p. 316) and the US edition at $2.00. The book features her detective Hercule Poirot.
The novel concerns the murder of an American heiress on Le Train Bleu, the titular "Blue Train". The novel entered the public domain in the United States in 2024; however, it will still be copyrighted in the United Kingdom until 1 January 2047, 70 years after the death of Agatha Christie.
Plot summary Poirot boards Le Train Bleu, bound for the French Riviera. So does Katherine Grey, who is having her first winter out of England, after recently receiving a relatively large inheritance. On board the train Grey meets Ruth Kettering, an American heiress leaving her unhappy marriage to meet her lover. The next morning, though, Ruth is found dead in her compartment, a victim of strangulation.
The famous ruby, "Heart of Fire", which had recently been given to Ruth by her father, is discovered to be missing. Ruth's father, American millionaire Rufus Van Aldin, and his secretary, Major Knighton, persuade Poirot to take on the case. Ruth's maid, Ada Mason, says that she saw a man in Ruth's compartment but could not see who he was. The police suspect that Ruth's lover, the Comte de la Roche, killed her and stole the ruby, but Poirot does not think that the Comte is guilty. He is suspicious of Ruth's estranged husband, Derek Kettering, who was on the same train but claims not to have seen Ruth. Katherine says that she saw Derek enter Ruth's compartment. Further suspicion is thrown on Derek when a cigarette case with the letter "K" is found there.
Poirot investigates and finds out that the murder and the jewel theft might not be connected, as the famous jewel thief "The Marquis" is connected to the crime. Eventually, the avaricious Mirelle, who was on the train with Derek—with whom she had been having an affair but, now spurned, is seeking revenge against him—tells Poirot she saw Derek leave Ruth's compartment around the time the murder would have taken place. Derek is then arrested. Everyone is convinced the case is solved, but Poirot is not sure. He does more investigating and learns more information, talking to his friends and to Katherine, eventually coming to the truth.
He asks Van Aldin and Knighton to come with him on the Blue Train to recreate the murder. He tells them that Ada Mason is really Kitty Kidd, a renowned male impersonator and actress. Katherine saw what she thought was a boy getting off the train, but it was really Mason. Poirot realised that Mason was the only person claiming to have seen anyone with Ruth in the compartment, so this could have been a lie. He reveals that the murderer and Mason's accomplice is Knighton, who is really the ruthless "Marquis". He also says that the cigarette case with the K on it does not stand for 'Kettering', but for 'Knighton'. Since Knighton was supposedly in Paris, no one would have suspected him. Derek did go into the compartment to talk to Ruth once he saw she was on the train, but he left when he saw she was asleep. The police arrest Knighton and the case is closed.
Characters Hercule Poirot, a private detective Rufus Van Aldin, the American millionaire, Ruth's father Ruth Kettering, Van Aldin's only daughter, Derek's wife Hon Derek Kettering, Van Aldin's son-in-law, Ruth's husband Mirelle, a Parisian dancer, Derek's gold-digging and later vengeful French lover Major Richard Knighton, Van Aldin's secretary Ada Beatrice Mason, Ruth Kettering's maid Comte Armand de la Roche, Ruth's swindling lover Monsieur Carrège, of French police Commissary Caux, of French police Mr. Goby, Rufus' informant Katherine Grey, formerly companion to the recently deceased Mrs Harfield, who has left her entire estate to Grey Dr. Harrison, friend of Katherine from the village of St. Mary Mead Mrs. Harrison, wife of the doctor, and friend of Katherine from the same village Amelia Viner, an elderly, terminally ill spinster and friend of Katherine Grey in St Mary Mead Rosalie Tamplin, Viscountess cousin of Katherine, owner of a villa on the Riviera Lenox Tamplin, Lady Tamplin's daughter Charles Evans, Lady Tamplin's much younger husband Demetrius Papopolous, jewellery dealer and an acquaintance of Poirot Zia Papopolous, daughter of Demetrius Pierre Michel, a conductor on the Blue Train; a character by the same name later appeared as a conductor in Murder on the Orient Express Joseph Aarons, Poirot's acquaintance, an expert in people involved in the "dramatic profession" (acting) who advises Poirot about the skilled impersonator Kitty Kidd, known by a different name for most of the novel Boris Ivanovitch Olga Demiroff Alice Ellen
Influence and significance
The novel's plot is based on the 1923 Poirot short story "The Plymouth Express" (later collected in book form in the US in 1951 in The Under Dog and Other Stories and in the UK in 1974 in Poirot's Early Cases).
The novel "also contains a number of firsts", which include "reference to the fictional village of St. Mary Mead... [later] the home of Agatha Christie's detective Miss Marple", in this work, the home of the character, Katherine Grey. (This location also appears in "The Tuesday Night Club", published in December 1927, the first short story to feature Miss Marple.) Also firsts were "appearance of Poirot's valet, George" and "of the minor recurring character, Mr Goby, who would also appear in After the Funeral and Third Girl".
Mere months after this novel was published, prolific French novelist Arthur Bernède published Le mystère du train bleu, in 1928. A murder mystery adventure featuring Bernède's own popular detective, Chantecoq, the story is set in Paris and the plot is completely different.
Literary significance and reception The Times Literary Supplement gave a more positive reaction to the book than Christie herself in its issue of 3 May 1928. After recounting the set-up of the story, the reviewer concluded: "The reader will not be disappointed when the distinguished Belgian on psychological grounds... builds up inferences almost out of the air, supports them by a masterly array of negative evidence and lands his fish to the surprise of everyone".The Times Literary Supplement, 3 May 1928 (p. 337)
The New York Times Book Review of 12 August 1928, said, "Nominally Poirot has retired, but retirement means no more to him than it does to a prima donna. Let a good murder mystery come within his ken, and he just can't be kept out of it."The New York Times Book Review, 12 August 1928 (p. 17)
British crime writer and critic Robert Barnard declared: "Christie's least favourite story, which she struggled with just before and after the disappearance. The international setting makes for a good varied read, but there is a plethora of sixth-form schoolgirl French and some deleterious influences from the thrillers. There are several fruitier candidates for the title of 'worst Christie'."Barnard, Robert. A Talent to Deceive – an appreciation of Agatha Christie – Revised edition (p. 200). Fontana Books, 1990.
Allusions
Allusions to other works in the Christie canon include the following. One of the characters in Death on the Nile recognises Poirot because of his involvement in The Mystery of the Blue Train: "Miss Van Schuyler said: ' I have only just realised who you are, Monsieur Poirot. I may tell you that I have heard of you from my old friend Rufus Van Aldin." That line was retained in the television film, even though Death on the Nile was broadcast first.
The novel features a Wagon Lit conductor called Pierre Michel which is the same name of another Wagon Lit conductor who appears in Murder on the Orient Express – it is never revealed whether these two characters are one and the same or different.
The titular Blue Train appears again in Three Act Tragedy where Poirot boards the train with Sir Charles Cartwright to return to England.
Adaptations
Television The novel was adapted for television in 2006, a special episode of the series Agatha Christie's Poirot, airing on ITV on 1 January. It was adapted by Guy Andrews and directed by Hettie Macdonald (who would later direct Curtain: Poirot's Last Case), and starred David Suchet as Poirot. Also featured were Roger Lloyd-Pack as Inspector Caux, James D'Arcy as Derek Kettering, Lindsay Duncan as Lady Tamplin, Alice Eve as Lenox and Elliott Gould as Rufus Van Aldin. It was "[r]eset in the late 1930s to match the rest of the Poirot TV series".
Changes from the novel
The television film includes several changes from the original novel. To tie in with the rest of the series, the setting is changed to the late 1930s. Additionally, Ruth's lover is travelling on the train with her, and they are both fleeing her husband. Lady Tamplin, Corky and her daughter Lenox also travel on the blue train. Ruth becomes friends with Katherine Grey. They switch train compartments, and when Ruth is bludgeoned to death, making her features unrecognisable, Poirot speculates that the intended victim may have been Katherine. Rufus, Ruth's father, has a wife in the film, who became insane after Ruth's birth, and Rufus has ensured her (his wife's) safekeeping at a convent, where she has become a nun. The character of Mirelle is changed to be Rufus's mistress, who visits Rufus's wife. She is mistaken by Rufus's wife to be her daughter Ruth. Additional changes in the film include Ada Mason trying to kill Katherine (because Knighton had fallen in love with Katherine and Ada was jealous). Katherine is saved by Lenox jumping on Mason and biting her on the neck. At the end of the film, the murderer, Major Richard Knighton, commits suicide by having himself run over by an oncoming train, instead of just being arrested by the French police as in the novel. The television film also shows Lady Tamplin's fourth husband (Corky by name) acquiring a ruby for her. In the book, Lady Tamplin's fourth husband is named "Chubby", and he has nothing to do with the ruby.
In the end, Katherine expresses a desire to travel, saying that she intends to take the Orient Express from Vienna. She asks Poirot if he has taken that train, and he says he has not. However, in a bit of foreshadowing, Poirot says that he would like to take the Orient Express someday, while Katherine talks about the romance of the train.
Radio The Mystery of the Blue Train was adapted for radio by BBC Radio 4, with Maurice Denham as Poirot, which was broadcast in six parts weekly, 29 December 1985—2 February 1986. This was the first of the adaptations of Poirot novels by BBC Radio.
Graphic novel A graphic novel with the content of this Christie work was published in 2005, in French, entitled Le train bleu, from Emmanuel Proust éditions. The Mystery of the Blue Train was released by HarperCollins as a graphic novel on 3 December 2007, adapted and illustrated by Marc Piskic. This was translated from the edition first published in France.
Publication history 1928, William Collins and Sons (London), 29 March 1928, Hardcover, 296 pp 1928, Dodd Mead and Company (New York), 1928, Hardcover, 306 pp 1932, William Collins and Sons, February 1932 (As part of the Agatha Christie Omnibus of Crime along with The Murder of Roger Ackroyd, The Seven Dials Mystery and The Sittaford Mystery), Hardcover (Priced at seven shillings and sixpence) 1940, Pocket Books (New York), Paperback, 276 pp 1948, Penguin Books, Paperback, (Penguin number 691), 250 pp 1954, Pan Books, Paperback (Pan number 284) 1956, Pocket Books (New York), Paperback, 194 pp