In Book 2 of this thrilling series for 6- to 9-year-olds, our hero, Kai Masters, must quickly jump into action when burning hot rock falls from the sky. He know

Only a wall divides Earth from the Beasts of Beastium. Only a boy and his dogbot defend the wall and protect Earth. Kai Masters. Border guard and beast battler.

Formerly published as Terradon. Kai must face the beast from the rock world. Will he need more than his X-Archer T10 to win against the hurl attacks?

All four Battle of the Worlds books in one great value giftbox PLUS an exclusive Border Guard Log Book! The water battle of Aquatan. The rock battle of Terradon