Shockwave: Battle for Earth by Hammer Trollkin

Earth has been invaded by alien forces with overwhelming technological superiority. But we are an amazing people, practiced in the art of war, holding a few technological advantages of our own. Shockwave is a fitting name for the elite special forces team that is our best hope to overcome the invaders and the dark powers that stand behind them. YA flair, with a storyline all who like Sci-Fi will enjoy. Series on sale. Come and explore the worlds of Hammer Trollkin.