The Adventure of the 'Western Star' Summary

Captain Hastings, Poirot's friend, notices a woman on the street when looking out the window of Poirot's room. Poirot identifies her as Miss Mary Marvell, a famous American film star. He suspects she is on the way to see him. Soon his predictions are confirmed, and the door bell rings. Mary Marvell brings threatening letters she received in relation to the diamond in her possession called the "Western Star."

The letters claim this diamond belongs to the gods and has to be returned. The first two letters contain only a request while the third warns that if the diamond is not returned it will be taken away during the full moon. The diamond was purchased by her husband, Gregory Rolf from a Chinese man so eager to get rid of it that he...