The Corroded Man (Dishonored #1)

A strange, shrouded figure appears in Dunwall, seeming to possess powers once wielded by the assassin known as Daud. Faced with the possibility that their deadliest foe has returned, Emily and Corvo plunge headlong into a life-and-death race against time. If they fail to learn the truth about this mysterious enemy, the result could be destruction on an unimaginable scale.