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In this classic mystery story, Sherlock Holmes (Ian Richardson) is requested to investigate deaths around the Baskerville mansion because Henry (Martin Shaw), the last direct heir to the Baskerville fortune is worried that he may die by their unique curse; a ghost hound has eliminated his ancestors and is now wreaking havoc in the woods again. The crafty Holmes sends faithful Dr. Watson (Donald Churchill) ahead to check things out, while unknown to Watson, Holmes assumes the disguise of a local gypsy to observe the mansion and anyone connected with it. As the mist of Grimpen Moor and the howling hound lend an eerie atmosphere to the tale, false leads take the protagonists into dead ends, and the real culprit waits in the wings for his chance.