Silverheart

This is a novel set at the very heart of Michael Moorcock's multiverse, in Karadur, city of metal, steam, and ancient families, the mighty clans of the metal. In six days, Max Silverskin, thief and trickster, must discover the secrets of his heritage or die from the witch mark - the silverheart - which will devour his heart. Lady Rose Iron, daughter of the leader of the powerful Clan Iron is thrown into an edgy alliance with Max as she searches for the secrets that could save the city's future. Captain Cornelius Coffin, head of the clans' security forces, is in love with Lady Rose and obsessed with capturing Max. And there are others, in Shriltasi, Karadur's underworld twin, who know the prophecy which says that only Max Silverskin can save both realms.
In Silverheart, Michael Moorcock and Storm Constantine have combined their talents to produce a novel that is both surreal and gothic.