Aurora Rising (The Prefect Dreyfus Emergencies, 1)

Award-winning author Alastair Reynolds creates "a fascinating hybrid of space opera, police procedural and character study" (Publishers Weekly) with this novel set in the Revelation Space universe.
Tom Dreyfus is a Prefect, a law enforcement officer with the Panoply. His beat is the Glitter Band, that vast swirl of space habitats orbiting the planet Yellowstone, the teeming hub of a human interstellar empire spanning many worlds.
His current case: investigating a murderous attack against one of the habitats that leaves nine hundred people dead. But his investigation uncovers something far more serious than mass slaughter -- a covert plot by an enigmatic entity who seeks nothing less than total control of the Glitter Band.