Ep. 1165, The Sign of the Four, Part 1 of 5, by Arthur Conan Doyle
Summary
Sherlock Holmes and Dr. Watson assist Mary Morstan, who receives mysterious annual pearls and a summons from an unknown benefactor. Holmes deduces the sender’s identity by analyzing handwriting and connecting the gifts to the recent death of Major Sholto, Mary’s father’s former comrade. The trio travels to a secluded London house, encountering a Hindu servant and a cryptic map hinting at a deeper conspiracy involving the "Sign of the Four."
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