Glen Cook 
Dragon Never Sleeps 

For four thousand years, the Guardships have ruled Canon Spaceimmortal ships with an immortal crew, dealing swiftly and harshly with any mercantile houses or alien races that threaten the status quo.But now the House Tregesser has an edge: a force from outside Canon Space offers them the resources to throw off Guardship rule. This precipitates an avalanche of unexpected outcomes, including the emergence of Kez Maefele, one of the few remaining generals of the Ku Warrior race-the only race to ever seriously threaten Guardship hegemony. Kez Maefele and a motley group of aliens, biological constructs, an scheming aristocrats find themselves at the center of the conflict. Maefele must chose which side he will support: the Guardships, who defeated and destroyed his race, or the unknown forces outside Canon Space that promise more death and destruction.