The Sign of Four (1987) (1987)

Mary Morstan has been receiving a mysterious pearl annually since her father's vanishing. Intrigued by her plight, Holmes and Watson delve into the case, uncovering a hidden agreement among four prisoners linked to the 1857 Indian Rebellion. As they piece together the puzzle, the duo confronts danger and deception, revealing dark secrets that have lingered for years. The search for answers not only aims to solve Mary’s mystery but also unearths a tale of betrayal and greed that ties the past to the present.