Who killed Guy Clarendon?


Hint 1 of 14:
Frances Nolan didn't.  That much should be obvious.
There wouldn't be much of a case if she did.

Hint 2 of 14:
Don't you remember hearing about how Frances frequently blacked out?
She told you herself from Old Bailey.

Hint 3 of 14:
Think about someone who frequently dined with Frances.

Hint 4 of 14:
He probably had a special talent.

Hint 5 of 14:
I'm talking about Dr. Trevalyan.

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