Question:  The Decagon House Murders borrows its basic plot structure from an Agatha Christie novel first published in which year ?

full_context: Document 1: Nazotoki wa Dinner no Ato de: Nazotoki wa Dinner no Ato de (謎解きはディナーのあとで , Lit. The After-Dinner Mysteries) is a Japanese television drama series based on the mystery novel of the same name by Japanese author Tokuya Higashigawa. It premiered on Fuji TV on October 18, 2011. This drama series was subsequently followed two-hour long special episode, then a film sequel.
Document 2: Nemesis (Christie novel): Nemesis is a work of detective fiction by Agatha Christie (1890–1976) and first published in the UK by the Collins Crime Club in November 1971 and in the US by Dodd, Mead and Company later in the same year. The UK edition retailed at £1.50 and the US edition at $6.95. It was the last Miss Marple novel the author wrote, although "Sleeping Murder" was the last Christie novel to be published.
Document 3: And Then There Were None: And Then There Were None is a mystery novel by English writer Agatha Christie, widely considered her masterpiece and described by her as the most difficult of her books to write. It was first published in the United Kingdom by the Collins Crime Club on 6 November 1939, as Ten Little Niggers, after the British blackface song, which serves as a major plot point. The US edition was not released until December 1939; its American reprints and adaptations were all retitled "And Then There Were None", after the last five words in the nursery rhyme "Ten Little Indians".
Document 4: List of prolific writers: Some writers have had prolific careers with hundreds of their works being published. While some best-selling authors have written a small number of books that have sold millions of copies, others have had lengthy careers and maintained a high level of output year after year. Dame Agatha Christie, the most-published novelist in history, is estimated to have sold 4 billion books, having written 69 novels and 19 plays. Her works were published between 1920 and 1976, equating to around three publications every two years. Dame Barbara Cartland has also sold millions of copies of her books but wrote many more than Christie. She spent 80 years as a novelist with 722 books published, averaging one book released every 40 days of her career. While Cartland wrote a significant number of full-length novels, other authors have been published many more times but have specialised in short stories. Spanish author Corín Tellado wrote over 5,000 novellas, selling 400 million copies of her books.
Document 5: The Decagon House Murders: The Decagon House Murders is a 1987 Japanese mystery novel and was the debut work of author Yukito Ayatsuji. Borrowing its basic plot structure from Agatha Christie's "And Then There Were None" (Christie's book is directly referenced by some of the characters at several points), it tells the story of a group of seven university students who travel to a deserted island that was the scene of a grisly mass murder six months earlier, where events soon turn ominous. "The Decagon House Murders" belongs to the honkaku subgenre of mystery fiction.
Document 6: The Wheel Spins: The Wheel Spins (a.k.a. The Lady Vanishes) is a 1936 mystery novel by British writer Ethel Lina White.
Document 7: Vintage Murder: Vintage Murder is a detective novel by Ngaio Marsh; it is the fifth novel to feature Roderick Alleyn, and was first published in 1937. The plot centers on a traveling theatrical troupe in New Zealand. One of the cast members was a minor character in "Enter a Murderer", and refers to that case early in the story.
Document 8: The Mystery of the Yellow Room: The Mystery of the Yellow Room (in French "Le mystère de la chambre jaune") is a mystery novel written by French author Gaston Leroux. One of the first locked-room mystery novels, it was first published serially in France in the periodical "L'Illustration" from September 1907 to November 1907, then in its own right in 1908.
Document 9: Uncle Tom's Children: Uncle Tom's Children is a collection of novellas and the first book published by African-American author Richard Wright, who went on to write "Native Son" (1940), "Black Boy" (1945), and "The Outsider" (1953). When it was first published in 1938, "Uncle Tom's Children" included only four novellas: "Big Boy Leaves Home," "Down by the Riverside," "Long Black Song," and "Fire and Cloud." "The Ethics of Living Jim Crow" and "Bright and Morning Star," which are now the first and final pieces, respectively, were added when the book was republished in 1940. The book's title is derived from Harriet Beecher Stowe's "Uncle Tom's Cabin," an anti-slavery novel published in 1852.
Document 10: Agatha Christie: Dame Agatha Mary Clarissa Christie, Lady Mallowan, DBE ("née" Miller; 15 September 1890 – 12 January 1976) was an English crime novelist, short story writer and playwright. She is best known for her 66 detective novels and 14 short story collections, particularly those revolving around her fictional detectives Hercule Poirot and Miss Marple. She also wrote the world's longest-running play, a murder mystery, "The Mousetrap", and six romances under the name Mary Westmacott. In 1971 she was elevated to Dame Commander of the Order of the British Empire (DBE) for her contribution to literature.
Document 11: The Sittaford Mystery: The Sittaford Mystery is a work of detective fiction by Agatha Christie, first published in the US by Dodd, Mead and Company in 1931 under the title of The Murder at Hazelmoor and in UK by the Collins Crime Club on 7 September of the same year under Christie's original title. It is the first Christie novel to be given a different title for the US market. The US edition retailed at $2.00 and the UK edition at seven shillings and sixpence (7/6).
Document 12: The Curious Incident of the Dog in the Night-Time: The Curious Incident of the Dog in the Night-Time is a 2003 mystery novel by British writer Mark Haddon. Its title quotes the fictional detective Sherlock Holmes in Arthur Conan Doyle's 1892 short story "Silver Blaze". Haddon and "The Curious Incident" won the Whitbread Book Awards for Best Novel and Book of the Year, the Commonwealth Writers' Prize for Best First Book, and the Guardian Children's Fiction Prize. Unusually, it was published simultaneously in separate editions for adults and children.
Document 13: The Act of Roger Murgatroyd: The Act of Roger Murgatroyd: An Entertainment is a whodunit novel written by Scottish novelist Gilbert Adair first published in 2006. Set in the 1930s and written in the vein of an Agatha Christie novel, it has all the classic ingredients of a 1930s mystery and is, according to the author, "at one and the same time, a celebration, a parody and a critique not only of Agatha Christie but of the whole Golden Age of English whodunits", but also "a whodunit in its own right, so that those readers who were completely uninterested in literary games of the so-called postmodern type could nevertheless settle down comfortably with a good, gripping and intentionally old-fashioned thriller". "The Act of Roger Murgatroyd" is also a locked room mystery.
Document 14: A Man Lay Dead: A Man Lay Dead is a detective novel by Ngaio Marsh; it is the first novel to feature Roderick Alleyn, and was first published in 1934. The plot concerns a murder committed during a detective game of murder at a weekend party in a country house. Although there is a side-plot focused on Russians, ancient weapons, and secret societies, the murder itself concerns a small group of guests at Sir Hubert Handesley's estate. The guests include Sir Hubert's niece (Angela North), Charles Rankin (a 46- or 47-year-old man about town), Nigel Bathgate (Charles's cousin and a gossip reporter), Rosamund Grant, and Mr and Mrs Arthur Wilde. Also in attendance are an art expert and a Russian butler. Unlike later novels, this novel is more focused on Nigel Bathgate and less so on Alleyn.
Document 15: The Red House Mystery: The Red House Mystery is a "locked room" whodunnit by A. A. Milne, published in 1922. It was Milne's only mystery novel.
ground_truth: 1939