Jim Butcher's The Dresden Files: Wild Card #5

It’s open war in Chicago between the police, the White Court, and the mafia network run by “Gentleman” Johnny Marcone! While Karrin Murphy recovers from her own confrontation with Puck, Harry must face off against the far more powerful being. Harry will need help from friends and enemies alike to prevent the demented fae from completing his masterpiece of pandemonium — but is it already too late?