The Adventure of The Western Star sees an actress threatened with the theft of a beloved diamond; in The Jewel Robbery at the Grand Metropolitan, a wealthy stockbroker's wife is burgled for her lustrous pearls; and in The Mystery of the Blue Train, a spectacular ruby causes an American heiress to lose her life.
At the end of each book it's usually the duty of the author's most famous creation, Belgian detective Hercule Poirot, to use his infamous "little grey cells" and recover the missing heirlooms.
Christie's own life even featured a diamond-related mystery. In 2010 a 19th Century brooch and three-stone ring that Christie inherited from her mother, both thought to have been lost after the author's death, were discovered in a locked.
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