"It's Vampires + X-Men + The Walking Dead" 

 In the future, humans trigger a nuclear winter lasting hundreds of years. Water levels rise. The shape of the world changes. When the world recovers, vampires emerge from the darkness. Their discovery leads to a war for supremacy … until synthetic human blood is created, ushering in a period of peace and prosperity.

And the world changes yet again. Vampires begin morphing into væmpires, warm-blooded creatures with an insatiable hunger for cold vampire blood. There is no rhyme or reason as to who morphs—male or female, old or young, from one end of the world to another—no vampire is safe. And no human is safe, either, because these væmpires aren’t interested in coexistence. They want three things: the eradication of humanity, the enslavement of vampires, and their ascension as the dominant species on the planet.

Vaempires: The best-selling series