Magic Edge - Dragon Born Alexandria, #1

Mercenary mage Alex Dering has spent most of her life killing deadly monsters for only peanuts in return-until the world's most legendary immortal hires her for a prestigious assignment in Europe. In return for hunting down misbehaving supernaturals, he's going to pay her a boatload of cash. But a straightforward slash and burn extermination in Zurich gets a whole lot more complicated for Alex when a gang of vampires steals one piece of a magical artifact that, once assembled, has the power to kill every supernatural in the city.
Well out of her depth, she's forced into a precarious partnership with a notorious assassin, a man as seductive as he is deadly. With a band of killers hot on their trail, Alex has no choice but to trust him-even if that trust could expose her most guarded secret. Magic Edge is the first book in the Dragon Born Alexandria urban fantasy series.