One for my enemy (Pan Macmillan)

The Antonova sisters are beautiful, cunning and ruthless, and their mother - known only as Baba Yaga - is the elusive supplier of premium intoxicants. Their adversaries, the influential Fedorov brothers, serve their crime boss father. Named Koschei the Deathless, his enterprise dominates the shadows of magical Manhattan. For twelve years, the families maintained a fraught stalemate. Then everything is thrown into disarray. Bad blood carries them to the brink of disaster, even as fate draws together a brother and sister from either side. Yet the siblings still struggle for power and internal conflicts could destroy each family from within. That is, if the enmity between empires doesn't destroy both sides first.