The colossal spaceship Matilda is hurtling through space, though no one is navigating any longer. Its dozens of decks have housed its inhabitants, and Baby Sun has provided energy for sustenance, for one thousand years. Denizens of the lower decks are virtual prisoners and slaves, so that citizens of the upper echelons may live in relative luxury. Aster, a lay-chemist and -healer, lives on Q deck, and in her scant spare time pores over the journals left by her mother before she disappeared mysteriously twenty-five years ago.
This is less a story "about space" than a novel about secrets, relationships and politics that just happens to take place aboard a spaceship. I really liked it, especially the character of Aster. Recommended.