Keeper of the Empire — H.J. Ralles

The Vorgs have landed! They're grotesque, they spit venom and Matt is is about to be their next victim. In the 3rd book of the Keeper series, Matt finds himself in a terrifying world. With the help of his friend Targon and a daring girl named Angel, Matt must locate the secret hideout of the Govan Resistance. There is no end to the action and excitement as Matt attempts to track down the Keeper, and win the next level of his computer game.