Timothy Zahn, author of Heir to the Empire, the best selling Star Wars novel of all time, has crafted a fresh, suspenseful tale of conflict in New York City that threatens to escalate into all-out genocidal warfare.For seventy-five years the Greens and the Grays have lived quietly among us in the shadows of New York, alien refugees from a war of attrition that utterly destroyed the rest of their kind. Passing as everyday citizens, yet with powers and technologies unknown to humanity, each group has long believed that they are all that remain of their old world and their terrible conflict.But now, to their mutual surprise, they have found each other, and the old hatreds and fears have once again risen to the surface.And each side is preparing again for war.