THE TARDIS LANDS IN NORWAY, AND IN A HOUSE on the shore of a fjord the Doctor, Yaz, Graham and Ryan find a young blind girl. Alone and terrified, Hanne thinks her father, Erik, has been taken away by a creature stalking the woodland. Hanne’s mother died some time ago. In a bedroom, Graham is nearly pulled through a mirror, which the Doctor deduces is a portal to another dimension where Hanne’s father could be. Locking the mirror portal open, the Doctor, Graham and Yaz step through it, leaving a reluctant Ryan to look after Hanne. The Doctor, Graham and Yaz find themselves in a network of tunnels and encounter an alien called Ribbons of the Seven Stomachs. Ribbons tells them they’re in the antizone, a buffer between dimensions. Ribbons has seen Hanne’s father pass by and barters to take them to him. Ribbons falls prey to large, flesh-eating moths, but the Doctor, Graham and Yaz gain sanctuary through another portal. In this mirror image of the house, they find Erik, who appears to be reunited with his deceased wife Trine.