Young Blood. Generation Slayer, #1

New York is a desolate wasteland overrun with vampires. To survive, a sixteen-year-old girl must do the unthinkable. Raven has carved out a precarious existence as a trader, navigating the treacherous underworld to secure supplies for herself and her autistic sister, Star. Their only sanctuary? A room in the local gun shop is provided by a kind-hearted owner who will risk everything to protect them.
They're safe -Until vampires swarm their doorstep and devour the only person willing to protect them. Desperate to keep her sister safe, Raven joins a covert military unit dedicated to eradicating the vampires that terrorize the city. Her life will be brutal - early morning workouts, grueling weapons training, and a deadly showdown with the bloodthirsty vampire who rules from the city's shadows. But even her new military family is far from safe.
Whispers of a traitor spread, and their knife might be angled at Raven's back. Young Blood is the first book in the new Young Blood series by Sylvester Barzey.