Whispers in the Blood - S K May

Book number in series: Book 1

Entire countries were destroyed when the nuclear war started. The vampires never wanted to reveal their existence, but they took control of the world to ensure that it survived.

Larissa lives a sheltered life in a small town, where she's grown to accept the life laid out for her. After the sudden tragic death of her mother, her sister, Lucianna, convinces her to move to London so they can both have a fresh start. She agrees, ignoring the warnings from those close to her.