Sherlock faces Culverton Season 4 Episode 2
Sherlock faces the serial killer Culverton Smith in "The Lying Detective"

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BBC Sherlock:
Sherlock Season 4 Episode 2: "The Lying Detective"
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Sherlock Season 4 Episode 2 Quotes

John: You did not kill Mary. She made a choice to save your life. You didn't make her do it, nobody could make Mary do anything. You didn't kill her.
Sherlock: In saving my life she conferred a value on it. It is a currency I do not know how to spend.

Why does everything have to be understandable? Why can't some things be unacceptable, and we just say that?