Holmes's loyal companion and doctor who assists in the investigation. He accompanies Holmes to interview Merrydew, learns about the coded clues and the Scarlet Ring, and helps track down the secret society's members.
Watson is Holmes's loyal investigative partner throughout the case.
Holmes repeatedly explains his deductions to Watson, and they jointly investigate the coded clues, murders, and Scarlet Ring.
Watson and Lestrade contribute to the same murder investigation.
Watson is present in the investigation of the society's murders alongside Holmes and Lestrade.
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