Certain Dark Things: Silvia Moreno-Garcia

Welcome to Mexico City, an oasis in a sea of vampires. Domingo, a lonely garbage-collecting street kid, is just trying to survive its heavily policed streets when a jaded vampire on the run swoops into his life. Atl, the descendant of Aztec blood-drinkers, is smart and beautiful - and very dangerous. Domingo is mesmerised.
Atl needs to escape the city quickly, to get far away from the rival narco-vampire clan relentlessly pursuing her. Her plan doesn't include Domingo, but little by little, she finds herself warming up to the scrappy young man and his undeniable charm. As the trail of corpses stretches behind her, local cops and crime bosses both start closing in.
Vampires, humans, cops, and criminals collide in the dark streets of Mexico City. Atl and Domingo stand little chance at all of making it out alive before the city devours them all - but they are determined to try...