In the concluding installment of the Peacekeeper series, Xander Martin and the crew of The Calyster return from the galactic center, having successfully completed their previous mission. The conflict with the Zalu Empire persists all throughout the galaxy, and the crew anticipates being assigned another challenging mission.

When the order for this new mission is issued by Terran Command, The Calyster departs immediately. However, they remain unaware that this mission will yield unforeseen consequences, ones that will alter the course of the galaxy forever.