Surrounded by corruption, Guard Ensign Alejandro Detweiler and his partner Abrianna Wright go separate ways. She flees to the safety of Refugee World, while he defends his conduct and his honor before a rigged court-martial. Reunited at last, they join in the hunt for a relentless killer, whose blows fall seemingly at random. In their pursuit, Al and Abrianna follow the assailant’s traces to the highest levels of Saturn System society, and a terrifying conclusion in the depths of the mines on the satellite Dione.