Blood Ties - The Searchers, #1

Maximilian Sterling has spent his life doing what he wants, when he wants, until he receives a summons home: his uncle has been murdered, found drained of blood in a London alleyway, and Max must return to England to settle his affairs. It can't hurt to have one last night to himself with a charming Parisienne. who unfortunately turns out to be a vampire, and is looking forward to having Max for supper.
American vampire hunter Ada Burgess just wanted to take a much-needed holiday. Yet duty won't let her ignore the bloodsuckers leaving a trail of destruction across Europe long enough to sightsee, including one trying to lure a delectable Englishman to his gory demise. But saving Max Sterling means having yet more problems to solve. Why was Max's uncle murdered by vampires? What do they want with Max? And does a devoted monster hunter like her have a chance at happiness with a wealthy bon vivant?