For the past six years, Mary Morstan has received a valuable pearl in the post. After the sixth pearl, an anonymous letter requests a meeting. Is this linked to her father's disappearance or the death of Major Sholto, her father's friend? This edition of Conan Doyle's classic Sherlock Holmes mystery...

For the past six years, Mary Morstan has received a valuable pearl in the post. After the sixth pearl, an anonymous letter requests a meeting. Is this linked to her father's disappearance or the death of Major Sholto, her father's friend? This edition of Conan Doyle's classic Sherlock Holmes mystery comes with accessible and informative notes.