A mysterious force blocks the TARDIS – with Amy inside it – from landing, keeping it stuck in a materialisation loop. It’s up to the Doctor to work out what that force is, lest Amy be lost forever along with his home. As he investigates, he learns of a house on Aickman Road, with a staircase which people walk up but never come back down. To solve this mystery, the Doctor must pass himself off as a normal human and share a flat with Craig Owens.