The Dred Chronicles

The prison ship Perdition, a floating city where the Conglomerate's most dangerous criminals are confined for life, orbits endlessly around a barren asteroid. Life inside is even more bleak. Hailed as the Dread Queen, inmate Dresdemona "Dred" Devos controls one of Perdition's six territories, bordered on both sides by would-be kings eager to challenge her claim. Keeping them at bay requires constant vigilance, as well as a steady influx of new recruits to replace the fallen. Survival is a constant battle, and death is the only escape.