From Saturday's Guardian:
Deepgate is a rambling, gothic city, suspended by chains over a bottomless abyss, entire districts at the mercy of gravity and the uneven stresses in its structure - one of the most striking images in modern fantasy fiction.
And from www.thebookbag.co.uk:
Goddess Ayen furious at the human wickedness shut down the gates of heaven and the souls of the dead are now forever roaming the bloody corridors of Hell. Ayen's son Ulcis rebelled and was cast down from the sky and now he dwells in the abyss gathering an army of souls and preparing to reclaim heaven for the faithful. Those inhabit Deepgate, a city suspended on chains over the abyss. All the dead of Deepgate are given to Ulcis.