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!