Mary Morstan has received a pearl in the post every year since her father's disappearance. This leads Holmes and Watson to the truth about a secret pact between four convicts during the Indian Rebellion of 1857.

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Main Cast: Jeremy Brett, Edward Hardwicke, Jenny Seagrove, Ronald Lacey, John Thaw, Emrys James, Alf Joint, Kiran Shah, Terence Skelton, Rosalie Williams

Director: Peter Hammond

Writer: John Hawkesworth

Editor: Anthony Ham

Cinematographer: Ray Goode

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