北京故宫

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。神秘专员假扮学生到高中保护一位特殊体质的女生，同时校园内还有其他势力盘踞，一种奇葩各显神通演绎校园囧事。。