In an alternate timeline in which the Klingons have conquered the Federation, Jean-Luc Picard leads a desperate struggle against the brutal grip of the Empire's iron fist. But as Terran Warlord Worf continues his scorched-Earth attacks on the planet, Picard's rebellion harbors an unlikely turncoat in its midst, with potentially devastating consequences. And should the Klingons seize control of the newly-awakened android Data, they will have perhaps the most powerful computer weapon in the galaxy...