Eighty years have passed since the invasion, and Earth is a Sorion outpost. William Colton has learned the Great Weapon to defeat his Sorion oppressors lies far below Manhattan. While searching underground, he finds Sondra Michaels, a tough, beautiful scientist and part of the resistance movement. But Sondra carries a secret that risks William's mission. She is a syntra. She has been hidden on Earth to give birth to the next Sorion king.