This series of Doctor Who has centred around a mystery vault the Doctor (Peter Capaldi) and Matt Lucas' Nardole are guarding – but what (or, more specifically, who) is inside it?

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That's the question bugging Whovians as we continue through series 10 – but last night's episode offered a crucial clue as to what lurks behind that intricate door.

In the closing moments, we saw the Doctor bring a bag of Mexican food for dinner with his guest/prisoner. As he took over the watch from Nardole, we heard the tinkering of a piano – a melancholy rendition of Fur Elise.

But when the Doctor promised to tell a tale about children being eaten, the tune switched to a bouncy version of Pop Goes the Weasel. Whoever's inside clearly likes bloodthirsty stories.

For Twitter, it all added up to a fan favourite character who we already know is returning in series 10: yes, Missy.

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Michelle Gomez was glimpsed in the trailer released at the start of the series and viewers have put two and two together and decided she's the one playing the piano...

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Doctor Who continues next Saturday at 7:15pm on BBC1

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