Arcadia was supposed to be Earth 2.0-a haven for humanity while they fought desperately to save their dying homeworld. But nothing has turned out like Cassiopeia Foster had thought. Another race, the Alku, already occupies the planet in a parallel dimension called Paxon. They are willing to help Earth, but a powerful contingent plans to strip-mine the strangely powerful Starfire from the planet, which will collapse the Paxon side and...