Charles Augustus Magnessen is the main antagonist of the third series and "the Napoleon of blackmail", according to Sherlock. He is based on Charles Augustus Milverton from Conan Doyle's short story, "The Adventure of Charles Augustus Milverton." He uses Mary Morstan to get to John Watson to get to Sherlock and finally Mycroft.

Sherlock later kills Magnessen in order to protect John, Mary, and their unborn child

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