The sign of four

Author's name: Arthur Conan Doyle

While Sherlock Holmes was complaining to his close friend, Dr. Watson, about his deadly boredom due to the lack of cases that would stimulate his unique faculties, he was visited by the beautiful young woman, Mary Morstan, who had been going through an ordeal since the disappearance of her father and the strange events that followed. Her father, Captain Morstan, had commanded a military battalion in India several years earlier, and shortly after his return to England, he disappeared under mysterious circumstances. After his disappearance, she received an anonymous letter in the mail every year containing a precious pearl. Holmes investigated the matter and discovered more surprises from the circumstances of the incident, including a murder shrouded in several other mysteries. So, who is sending these pearls to Miss Mary Morstan? Who killed the heir to Captain Morstan's friend? And why? What is the secret of the strange "Four Marks" left by the killer at the crime scene? Whose are the small footprints found near the body? Who is the man with the wooden leg? And what is the secret of the treasure that Morstan found during his service in India? Read the story and participate in solving these exciting mysteries.