Captain Nova Whiteside, on a brand new assignment to help rid the Commonwealth Union of Planets from a growing rebel force, is teamed up with Tychon, a straight-laced Vanguard commander. His opinion of Humans, and of subordinate officers, is less than stellar. Their pursuit of a ruthless rebel leader takes them through the worlds and dangers of the Centauri-occupied Targon sector where the line between their personal lives and their mission quickly begins to blur. On their quest to recover a dangerous, living weapon in rebel hands it seems that the greatest opposition comes from among their own people and Nova must choose between duty to her Command and loyalty to her friends.