Episode 4: Knock Knock

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Written by Mike Bartlett, directed by Bill Anderson. Guest star: David Suchet

“Did you hear the trees creaking outside when we arrived?”

“Yeah. It was the wind.”

“There wasn’t any wind.”

Bill is moving in with some friends and they’ve found the perfect house! So what if it’s strangely cheap to rent, and the landlord is a little creepy? The wind blows, the floorboards creak and the Doctor thinks something is very wrong. What lurks in the strange tower at the heart of the building – and why can’t they find any way to enter it..?

Next: Episode 5 – Oxygen

Read more in the new issue of Radio Times magazine, with interviews with Peter Capaldi, Pearl Mackie and much, much more

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