In THE SIGN OF THE FOUR (the second Sherlock Holmes mystery), a distressed and beautiful young lady arrives at the offices of Sherlock Holmes. Each year following the strange disappearance of her father, Miss Morstan has received a rare and lustrous pearl. Now, on the day she is summoned to meet her anonymous benefactor, she comes to consult with Holmes and Watson.
Sir Arthur Conan Doyle (1859-1930) was a Scottish physician who began writing as a way to pass time between patients at his medical practice. Most famous for creating the fictional detective Sherlock Holmes, Doyle wrote dozens of other works of fiction and several influential non-fiction works.