A resident of Merripit Hall who interacts suspiciously with Watson. He hosts a dinner where bizarre events occur and later joins a group chasing Sir Henry, only to be trapped in a quagmire. He is the mastermind behind the plot to steal the Baskerville fortune and estate.
Watson identifies Stapleton as a suspicious figure who sets traps for the protagonists.
Dr. Mortimer collaborates with Stapleton in the plot to eliminate the protagonists.
Frankland aligns with Stapleton to participate in the lethal chase on the moors.
Mrs. Barrymore's family connection ties her to Stapleton's conspiratorial dinner gatherings.
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