The Doctor brings her companions home to modern-day Sheffield. But while Graham confronts the loneliness of the home he once shared with Grace, the Doctor and Ryan stumble upon the corpse of Yaz's neighbour, covered in spiderwebs. They soon learn that arachnids across the region have been acting strangely in recent months, and the trail of clues leads to a new luxury hotel developed by businessman Jack Robertson, who has abruptly fired Yaz's mum from her position as its manager. Soon the time travellers find themselves trapped inside the building, surrounded by an army of giant spiders.