El signo de los cuatro

The second of the adventures of Sherlock Holmes and Dr. Watson begins when an enigmatic young woman, Mary Morstan, goes to the detective to tell him that, since her father mysteriously disappeared ten years ago, she regularly receives pearls of great value by mail. . These are sent by a stranger who has summoned her to see her, and Holmes and Watson agree to accompany her. This will be an encounter that will lead the three protagonists of the story to the trail of a hidden treasure.