Ianto Jones has been hiding a very big secret at Torchwood - his half-converted girlfriend from the Canary Wharf Battle - down in the basement. He is quick to hire a Japanese doctor who believes he can "cure" her. But things soon go wrong, and the Cyberwoman's destructive powers are released to the whole of Torchwood. Upgrading is compulsory.

Concerned that the Rift is spreading, the Torchwood team investigates a series of gruesome deaths located in a small isolated village in the Brecon Beacons. What sort of creature could cause such shocking injuries? Stranded without communications or equipment, and separated from one another, the team confronts a terrifying enemy.