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Holmes is hired by the débutante Lady Eva Blackwell to retrieve compromising letters from a blackmailer: Milverton, who causes Holmes more revulsion than any of the 50-odd murderers in his career. Milverton is "the king of blackmailers". He demands £7,000 for the letters, which if given to third parties would cause a scandal that would end Lady Eva's marriage engagement.
Episodes
1The Speckled Band 2The Illustrious Client 3The Devil's Foot 4The Copper Beeches 5The Red-Headed League 6The Abbey Grange 7The Six Napoleons 8The Man with the Twisted Lip 9The Beryl Coronet 10The Bruce-Partington Plans 11Charles Augustus Milverton 12The Retired Colourman 13The Disappearance of Lady Frances Carfax