First in a planned trilogy called, "Jacob's Ladder," "Dust" introduces
us to a decaying generation ship, stuck in orbit around an unstable
star. Originally the project of a religious cult, both the people and
the AIs of the ship have devolved strangely as the years have gone by.
Now, a last few bastions of people live feudally, at war with one
another, and splintered artificial intelligences believe they are gods
or angels - and are also in bitter rivalry.
In a feudal dungeon, the servant girl Rien is assigned to care for a
mutilated angel - the warrior Ser Perceval. But Perceval tells Rien
that they are truly sisters, and the two girls set out on a quest to
escape and prevent a disastrous war.
Meanwhile, the AIs of the ship begin to realize that they must somehow get the derelict running and away from the star, or all will expire in a fiery inferno...