Join Harry and Ava as they battle space monsters, in a thrilling new adventure series that's out of this world! Harry and Ava are space cadets living aboard Vantia1, a massive space station that was created after a black hole swallowed their home planet. The black hole was the work of an evil scientist, Vellis, who is holding Harry's parents hostage - and now he's invented a new and terrifying Beast, a three-headed droid dog that can dig up the precious element Vellis needs to power his deadly superweapons. Only Harry and Ava can defeat Vellis and rescue everyone from certain doom . Book 4 in this gripping series. Don't miss Space Wars: Curse of the Robo-Dragon if you want to find out about Harry and Ava's first adventure!.