The Damascus Chronicles

The first book in the series, The Damascus Chronicles takes place in an alternate futuristic dystopian Las Vegas. Michael Damascus, a former government agent turned professional assassin for the Italian Mafia, is trapped between the worlds of organized crime and the supernatural. Betrayed by his family and government, Michael unites with a seven centuries old coven and his mob families' international organization, to defeat a criminal consortium and global secret society of occultists. While preventing the destruction of all creation, he must also protect his orphaned kid-niece who he has taken in (and an ex-love who can't let him go) from his dark gift and double life, with the police commissioner hot on his trail.