Formula and Plot Devices
Almost all of Agatha Christie's books are whodunits, focusing on the British middle and upper classes. Usually, the detective either stumbles across the murder or is called upon by an old acquaintance, who is somehow involved. Gradually, the detective interrogates each suspect, examines the scene of the crime and makes a note of each clue, so readers can analyse it and be allowed a fair chance of solving the mystery themselves. Then, about halfway through, or sometimes even during the final act, one of the suspects usually dies, often because they have inadvertently deduced the killer's identity and need silencing. In a few of her novels, including Death Comes as the End and And Then There Were None, there are multiple victims. Finally, the detective organises a meeting of all the suspects and slowly denounces the guilty party, exposing several unrelated secrets along the way, sometimes over the course of thirty or so pages. The murders are often extremely ingenious, involving some convoluted piece of deception.
Christie's stories are also known for their taut atmosphere and strong psychological suspense, developed from the deliberately slow pace of her prose.
Seven stories are inspired by a nursery rhyme: And Then There Were None by Ten Little Indians; One, Two, Buckle My Shoe by One, Two, Buckle My Shoe; Five Little Pigs by This Little Piggy; Crooked House by There Was a Crooked Man; A Pocket Full of Rye by Sing a Song of Sixpence; Hickory Dickory Dock by Hickory Dickory Dock, and Three Blind Mice by Three Blind Mice.
Twice, the murderer surprisingly turns out to be the unreliable narrator of the story.
In six stories, Christie allows the murderer to escape justice (and in the case of the last three, implicitly almost approves of their crimes); these are The Witness for the Prosecution, Five Little Pigs, The Man in the Brown Suit, Murder on the Orient Express, Curtain and The Unexpected Guest. (When Christie adapted Witness into a stage play, she lengthened the ending so that the murderer was also killed.) There are also numerous instances where the killer is not brought to justice in the legal sense but instead dies (death usually being presented as a more 'sympathetic' outcome), for example Death Comes as the End, And Then There Were None, Death on the Nile, Dumb Witness, The Murder of Roger Ackroyd, Crooked House, Appointment with Death, The Hollow, Nemesis, Cat Among the Pigeons, and The Secret Adversary. In some cases this is with the collusion of the detective involved. In some stories the question of whether formal justice will be done is left unresolved, such as Five Little Pigs, and arguably Ordeal by Innocence.
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