The Adventure of "The Western Star": a Hercule Poirot Short Story

Movie star Mary Marvell consults with Hercule Poirot after receiving threatening letters that warn her to return her diamond, the famous "Western Star," to its rightful owner. As far as she is concerned, she's the rightful owner! Who is this person, the rightful owner of the diamond? Is it even the genuine article? On the same day the owner of the "Eastern Star" arrives to consult the famous detective. Amazing! A coincidence? Librarian's note: this entry is for the story, "The Adventure of "The Western Star." Collections of short stories by the author can be found elsewhere on Goodreads. The individual entries for all Poirot short stories can be found by searching Goodreads for: "a Hercule Poirot Short Story."