The war between the Sentient Concord and the Earth Federation grinds on, but dark forces are moving behind the scenes, forces intent on unleashing terror on a scale never seen before, a terror that has already spread beyond Commander Hrothgar Tebrey's universe. On an alternate Earth, acid rains fall smoking from the steely skies, and feral things that were once human skitter through the ruins. Tebrey's father Daeren Drake searches for clues about the enemy and finds more than he bargained for. Meanwhile, Lt. Commander Tonya Harris and Ghost stumble upon an engine, a weapon that must never be used, but already has been... by the enemy. Loyalties will be tested, dark pasts revealed, and the enemy will strike a blow at the heart of the Concord from which it may never recover.