From Amazon.com
Six centuries after the alien Curosa imparted the wisdom of their dying race to Adrian Sawyer and gave him three massive city-ships, two of those ships --
City of Diamond and
City of Opal -- are locked in a battle for intergalactic political dominance. Now the Protector of
Diamond has chosen a protege, young Adrian Mercati, and told him the hiding place of the Sawyer Crown, an artifact that will give him and the
Diamond unassailable superiority over the
Opal. But spies are at work, and a desperate race to find the Crown begins. Yet what neither side can see is that finding it may prove their downfall.
Ingram
The newly appointed Protector of an intergalactic city-ship, Adrian Mercati is urged by his predecessor to strengthen his position by locating the Sawyer Crown, an alien artifact that will give him superiority over his enemies. Original.