Thaddeus Blaklok – mercenary, demonist, bastard and thug-for-hire – is pressed into retrieving a mysterious key for his clandestine benefactors. Little does he know that other parties seek to secure this artefact for their own nefarious ends and soon he is pursued by brutal cultists, bloodthirsty gangsters, deadly mercenaries and hell spawned monsters, all bent on stopping him by any means necessary.

In a lightning paced quest that takes him across the length and breadth of the steam-fuelled city of Manufactory, Blaklok must use his wits and his own demonic powers to keep the key from those who would use it for ill, and open the gates to Hell itself.