Sherlock smiles dryly, examining the page.

"Well done. I of all people am hardly in a position to condemn you for prying into my business. I might be given to object if you had made a mess of it, but you haven't."

He holds it out to her.

"There are any number of reasons why I would be unwise to give you the answer, not least of which is that I doubt you'd believe it if I did. And yet I am nearly tempted to do it anyway."