There's a house on Aickman road with a staircase that people go up, but never down... To solve the mystery of the man upstairs, the Doctor must pass himself off as a normal human being, and share a flat with Craig Owens.

As the Doctor prepares for his inevitable death at Lake Silencio, he visits a former roommate and learns that the Cybermen are responsible for a series of disappearances at a local department store and resolves to investigate.