Dusk Falling 

I took the liberty of taking this from the Raincrow website, it explains it far better than I could. I'm totally addicted.

"V is a game of strategy. A movement based game unlike any you've experienced. Hunt other players, create powerful clans, rule your city—or the world. Location based missions, distinct player talents, monthly events, all driven by episodic storytelling. You can even unlock powerful items like the Janus Mirror that allow you to hunt in cities all over the world. Embrace your inner vampire, Play the Story."