Exodus: The Archimedes Engine by Peter F. Hamilton (Random House Worlds): A space opera set 42,000 years after humanity's departure from Earth in arkships, where the descendants of the first settlers, now powerful and alien "Celestials," rule over the latest arrivals from a newly discovered, long-lost arkship. The story follows multiple characters as they navigate the oppressive Celestial hierarchy, engage in political intrigue within the Celestial courts, and uncover plots that threaten the balance of the Centauri Cluster.
Exodus: The Helium Sea by Peter F. Hamilton (Random House Worlds): For millennia, the Crown Dominion has been at relative peace, with the Celestials in control and the human population little better than serfs. But now the Crown Dominion is facing a crisis of epic proportions—one that could change the balance of power in the Centauri Cluster forever—as an exiled faction that has been waiting for seven thousand years beyond the Helium Sea has returned to claim their vengeance.