The Battle for Earth (Paperback) (ISBN-13: 9781923360464)

The Tagaar are an ancient race of warrior aliens. They're determined to make our planet their own-and they intend to use our teenage superheroes to help them do it. Kidnapping Brodie, the Tagaar promise her safe return-if Axel steals the deadly Stonekiller weapon. It's a weapon that can turn a person to a block of stone-but they do not die. Instead, they are condemned to exist as a living statue forever.

And the person they want Axel to use it on is the Russian President...

If things aren't bad enough, the ancient sorceress, Morgan le Fay has made a reappearance. She's centuries old and is one of the most powerful humans to have ever lived. She has the ability to take away anyone's free will. Whilst under her spell, a person can be forced to do anything she commands.

And she doesn't care who she hurts...