The Witness For the Prosecution by Agatha Christie

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The Witness For the Prosecution is a short story written by Agatha Christie. Leonard Vole is arrested for the murder of Emily French, a wealthy older woman. Unaware that he was a married man, Miss French made him her principal heir, casting suspicion on Leonard. When his wife, Romaine, agrees to testify, she does so not in Leonard’s defence but as a witness for the prosecution. Romaine’s decision is part of a complicated plan to free her husband. She first gives the prosecution its strongest evidence, then fabricates new evidence that discredits her testimony, believing that this improves Leonard’s chances of acquittal far more than her testimony for the defence. It is then revealed that Leonard Vole actually did kill Emily French.