David Osage must rescue the mysterious young Navigator - she's the key to sending the Fosk-ha away forever. But he has to keep his sister from turning into a monster, even though they need that monster to fight the enemy. Although uneasy, Earth's fighters must form an alliance with an alien overlord who has an agenda of his own. Can they choose the winning side, and if they do, can they live with it? The Fosk-ha have never lost a war, but the battle for Earth will be like nothing human or alien has ever seen. Join the fight to save Earth!