Sanctum - The Xenoworld Saga, #4

Shanti's quest hangs on the edge of a knife... With Isaru's state critical, Shanti and the crew must leave him in the Hollow. They return to Colonia, this time with leverage that might see her parents saved. But things go from bad to worse when the Sanctum seeks retribution. Shanti finds herself a hunted woman. Former friends have turned to enemies as she flees to the Ruins. There, she hopes vainly that the Sphere Priests will know the true location of Anna's prophecy.
They point her in the last place she expected -- the domed cities of the Shen Collective. When she meets with the Collective's overseer, a godlike AI, she learns the incredible truth. That truth will change everything...