I really enjoyed Knock Knock .... until the ending. Up until then, it had been gripping, scary and with a truly memorable and eerie creation in Eliza.
It wasn't so much the 'twist' more the prolonged scene itself and of course the saving of all the dead characters - a habit in Moffat's Who that is getting tiresome, to say the least.
So, a really good story, let down by the ending. Pity.
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