Earth is overrun.... Chris Randall and his family are on the run with a group of renegade soldiers led by General Gold. Having stolen a Kyron shuttle and escaped from the occupied cities, they are safe - for now. General Gold has a plan to strike back against the Kyra. Meanwhile, one of Earth's old colony ships has returned, and they have revealed the invaders' weakness: the Chrona. But are the Chrona a new enemy or a friend? Chris isn't sure, and he isn't convinced that striking back is a good idea. Yet, one thing he knows without a doubt: The fate of the human race hinges on the answer.