Moanna Morgan's attempt to steal the vaccines to the Omega toxin has failed. The Sunken City has been destroyed, betrayed by Jason Morgan, but the Federation will not celebrate its victory for long. The threat of the Omega toxin is looming. Now Moanna is in custody and facing the scant mercy of Naval Intelligence. Beyond the Frontier, the unhinged and vainglorious Garrett McCall marshals his forces, ready to strike a deadly blow for the Pioneer cause. Alone and adrift in a floating tower, ex-MANTArine McPhail needs a way out, and fast. And Hamilton Khan is ready to set off in search of the buried gold reserves in Old New York, but an old enemy has other ideas. All across Thalassa, events are moving towards a final confrontation. At the heart of it lies a conspiracy many years in the planning, one that will sweep everything else away...