The Algeans have been found by the Empire and they are searching for an answer to the orange pods being harvested by the Black Ships. If they are successful in finding a way to kill the pods, then the main tool of destruction used by the Invaders will be eleminated. However, success means angering the power behind the Invaders and there is a rising fear that it will take revenge on the Empire for destroying its drug supply.
The magnatude of that revenge is beyond what anyone in the Empire imagined.
The action continues in Death of an Empire as the Emperor continues the struggle to survive against an ancient enemy.