The novel “Sting of the Zygons” by Stephen Cole was published for the first time in 2007.

The Tenth Doctor takes Martha Jones in the English Lake District region in 1909. There they discover that people are hunting the “Beast of Westmorland” that has even attracted the interest of King Edward VII, whose arrival is expected in the area. The Beast was sighted but the Doctor realizes that it’s a Skarasen and its presence means that in the area there are Zygons as well.

The Doctor knows the grave danger linked to the Zygons, who can take the shape of the humans they take prisoner. He needs to find out as soon as possible the aliens’ plans but who can he trust when anybody could be one of them?