Benedict Cumberbatch.

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.
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Or the smaller answer.

- John, you’re late again. You should work less hard for your own health.
- I don’t believe you, Sherlock. You are not here. I don’t believe you.
I was made to walk out into the swimming pool area where, I discovered, Sherlock was waiting. The voice in my ear, which I vaguely recognised, told me to say some stuff - which, I realised, gave the impression that I was behind it all. That I, John Watson, was Moriarty. I could see the look in Sherlock’s eyes - a flash of, not anger, but hurt. For a second, he looked like a little, lost child. I should have been horrified that he’d even doubt me for a second but, to be honest, it was so refreshingly human of him. He actually did value our friendship. He did, despite himself, care.