The veil - Chloe Neill

Seven years ago, the Veil that separates us from what lies
beyond was torn apart, and New Orleans was engulfed in a supernatural
war. Now, those with paranormal powers have been confined in a walled
community that humans call the District. Those who live there call it
Devil's Isle.

Claire Connolly is a good girl with a dangerous secret: she's a
Sensitive, a human endowed with magic that seeped through the Veil.
Claire knows that revealing her skills would mean being confined to
Devil's Isle. Unfortunately, hiding her power has left her untrained and
unfocused.

Liam Quinn knows from experience that magic makes monsters of the
weak, and he has no time for a Sensitive with no control of her own
strength. But when he sees Claire using her powers to save a human under
attack - in full view of the French Quarter - Liam decides to bring her
to Devil's Isle and the teacher she needs - even though getting her out
of his way isn't the same as keeping her out of his head.

As more and more Sensitives fall prey to their magic, and unleash
their hunger on the city, Claire and Liam must work together to save New
Orleans, or else the city will burn...