Dark Ages: Lasombra — David Niall Wilson

The situation in Constantinople has degenerated into sheer chaos, as vampires of every stripe prey on the ruined metropolis. Lucita, the young envoy of Clan Lasombra, is caught in the middle and cut off from her elders in Europe. Alone, she faces the impossible task of making the city her own, lest she become another victim in the War of Princes.