The City and The Ship (Brainship, #4, #7)

Two novels in one large volume, both set in the same universe as The Ship Who Sang: The City Who Fought: Simeon was bored with running the mining and processing station that made up his "body." Then the invaders came. If anyone was to survive, somehow he must transform his wargaming hobby into the real thing and become The City Who Fought. The Ship Avenged: Ten years later, Joat, the eleven year old techno-demon heroine of the first novel is now an adult herself. She and her ship are on the trail of the Kolnari space raiders, trying to stop them before they can spread an infectious, mind-destroying disease among the inhabited stars and destroy civilization throughout the galaxy.