Dishonored casts you as a supernatural assassin driven by revenge. You are Corvo, the once-trusted bodyguard of the beloved Empress. Framed for her murder, you become an infamous assassin, known only by the disturbing mask that has become your calling card. In a time of uncertainty, when the city is besieged by plague and ruled by a corrupt government armed with strange technologies, dark forces bestow supernatural abilities upon you.

http://www.youtube.com/watch/?v=beSPh579_y8