Miss Mary Morstan contacts Sherlock Holmes for his help regarding her father, captain Morstan, who disappeared 10 years ago. Since his disappearance she annually receives a valuable pearl by post from an unknown person. The mystery leads Holmes and doctor Watson into an intricate plot regarding a lost treasure belonging to four convicts on the Andaman Islands 　　译文(2): 玛丽 · 莫斯坦小姐联系夏洛克 · 福尔摩斯寻求他的帮助关于她的父亲，莫斯坦上尉他十年前失踪了。自从他失踪后，她每年都会收到一个不知名的人寄来的珍珠。这个谜团让福尔摩斯和华生医生陷入了一个错综复杂的阴谋，关于 Andaman Islands 上四名罪犯遗失的财宝