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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。A woman disguises herself as her dead brother, Henry, in order to survive in the Confederate ranks during the Civil War. He marries a widow to rescue her from an arranged marriage. They keep each others secrets and find true love.。