so many declarations of love!

), that it had to be setting us up for a fall.

A figurative one, this time.

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Sherlocks indestructibility established, the something bad dangles Damoclean over other heads than his.

If either, is she victim or trap?

These all being deductions of Sherlocks, we havent been yet privy to their proof (cleverness aside).

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How often, though, is the man wrong?

Anyone fancy a go at reverse-engineering those conclusions?

The most intriguing of these text-on-screen deductions has to be liar.

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About what else though, and to whom, has Mary lied?

Oh, and in other news, Ive got engaged.

But, its not something Im really going to talk about much here.

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I want to keep some things private.

I will say, though, shes the best thing thats ever happened to me.

Amanda Abbingtons Mary is warm, funny, clever and very welcome addition to Sherlocks gang.

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it’s crucial that you work on your half of the church, Mary.

Looking a bit thin, said Sherlock in The Sign Of Three.

An orphans lot Mary replied, Just friends.

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When and in what circumstances didSherlocks Mary lose her parents?

Did she ever know them?

Who brought her up?

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After all, John was kidnapped from outside 221B Baker Street, not from his own house or surgery.

Something in the next entry suggests that Mary Morstan is no stranger to Magnussen… Mary is visibly perturbed by the message, which seems innocuous enough (Mary, lots of love poppet.

Oodles of love and heaps of good wishes from Cam.

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Wish your family could have seen this).

What hold might the legendary blackmailer have over Mary?

We awaitHis Last Vowto find out.

His Last Vow airs on BBC One on Sunday the 12thof January at 8.30pm.

Read our spoiler-filled review of The Sign Of Three,here.