Earth's recent reprieve from full-scale disaster is about to end sooner than expected. The second book in the Sentinels of Tzurac trilogy, Zarkwin's Revenge begins five years after the conclusion of Terra Major Under Threat. When Jackson and Khaneera, both serving life sentences for their crimes against the Federation, escape prison, their unfinished mission snaps back into place, reigniting the rebel forces-and their own feelings for each other. Having failed their operation once, they don't intend to taste defeat again. And Khaneera knows exactly how to ensure they get to celebrate the spoils this time. With the rediscovered Xytrinium infusion formula in hand, they can infuse their mercenaries with the same enhanced powers as the Sentinels. Now on equal footing and with secret attacks up their sleeves, the rebel forces are confident they can eradicate the Sentinels, destroy the Federation, and retrieve the wealth of Xytrinium reserves from Earth. But what if one rebel starts to grow a conscience? Will a little advanced warning be enough to help Earth and the Federation thwart the rebels once again-or is it their turn to feel the sting of defeat?