How a single historical mystery hides its clue inside an object the period had just invented

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Poirot straightens the ornaments and Miss Marple knits: both are reading the room in different costumes The ice-and-string tricks behind most locked room mystery solutions stopped working once readers learned them Ronald Knox's ten commandments for detective fiction banned the secret passage and the unknown twin Very few Golden Age locked-room mystery novels actually obey all ten of Knox's rules When the solution depends on a period law nobody has heard of the fair-play rule in a historical mystery breaks Getting the money right matters more than getting the clothes right in a historical mystery Series that age in real time versus historical mysteries frozen in one decade Opening a historical mystery with a scene set centuries earlier usually gives away the motive A plague quarantine is the most efficient suspect-pool shrinker a historical mystery has Starting with the Roman ones is the wrong way into historical mysteries and everybody does it