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Dangerous to Know: A Novel of Suspense (Lady Emily Mysteries) (edition 2010)
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Wikipedia in English
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Recovering at her mother-in-law's estate in Normandy after a brush with death, Lady Emily Hargreaves discovers a murder victim whose death looks like the act of Jack the Ripper, a killing that compels her to follow clues to the medieval city of Rouen in search of a lost child.
(summary from another edition)