1 The Mysterious Affair at Styles | The Mysterious Affair at Styles | 1920 | Hercule Poirot | Novel | Poirot’s debut — investigates the poisoning of a wealthy heiress in a country manor. | - | - |
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2 The Murder on the Links | The Murder on the Links | 1923 | Hercule Poirot | Novel | Poirot untangles a case of love, blackmail, and murder at a French golf course. | TV Episode | Adapted in "Agatha Christie's Poirot" (ITV series). |
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3 Poirot Investigates | Poirot Investigates | 1924 | Hercule Poirot | Short Stories | A collection of clever short mysteries featuring Poirot’s brilliant deductions. | - | - |
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4 The Secret Adversary | The Secret Adversary | 1922 | Tommy and Tuppence Beresford | Novel | Two young adventurers take on international intrigue and espionage. | TV Series | Adapted as part of "Partners in Crime" BBC series (2015). |
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5 The Man in the Brown Suit | The Man in the Brown Suit | 1924 | Anne Beddingfeld | Novel | A young woman stumbles into an international conspiracy after witnessing a death. | TV Movie | TV film adaptation aired in 1989. |
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6 The Murder of Roger Ackroyd | The Murder of Roger Ackroyd | 1926 | Hercule Poirot | Novel | One of Christie’s most famous twists — a small-town murder with shocking revelations. | TV Series, Films | Multiple adaptations including ITV’s Poirot (David Suchet) and films. |
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7 The Big Four | The Big Four | 1927 | Hercule Poirot | Novel | Poirot faces a global crime organization in a thriller-style mystery. | - | - |
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8 The Mystery of the Blue Train | The Mystery of the Blue Train | 1928 | Hercule Poirot | Novel | Poirot solves a jewel theft and murder aboard a luxurious train. | - | - |
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9 The Seven Dials Mystery | The Seven Dials Mystery | 1929 | Bundle Brent | Novel | A secret society, hidden clocks, and murder in a country house. | - | - |
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10 The Murder at the Vicarage | The Murder at the Vicarage | 1930 | Miss Marple | Novel | Miss Marple’s debut — murder in a quiet English village reveals nasty secrets. | TV Movie, TV Series | Adapted into multiple Miss Marple TV versions (BBC, ITV). |
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