The Adventures of Sherlock Holmes and Dr Watson (film)

Part 1: The King of Blackmailers

After solving another case, Sherlock Holmes and Doctor Watson return to London by train.

Shortly afterwards, Holmes and Watson are invited to The Diogenes Club by Sherlock's older brother Mycroft. The club hosts the most unsociable men of London, and they have banned talking. Once there, Mycroft, asks him to help Lady Eva Blackwell. She is being blackmailed by one of the most villainous men of London, Charles Augustus Milverton who is demanding £7,000 for some letters he has stolen from her, threatening to release them to the public if she does not pay the ransom. Upon their release, the letters would cause a scandal that would end Lady Eva's marriage engagement. Sherlock agrees to help her.

The same day, Milverton himself shows up at 221B. He reveals that he knows about Holmes' task and requests £7,000 for the safe return of the letters. Sherlock and Watson decide that stealing the letters from Milverton is their only course of action. The two break into Milverton's headquarters at night and find the letters in his safe, but they hide when Charles Augustus suddenly appears in the room. He has a meeting with a supposed maidservant offering to sell letters that would compromise her mistress.

In the end, Holmes and Watson find an encrypted letter which divulges details of the continuing mystery.