The Casquette Girls by Alys Arden 

After the storm of the century rips apart New Orleans, sixteen-year-old Adele Le Moyne wants nothing more than her now silent city to return to normal. But with home resembling a war zone, a parish-wide curfew, and mysterious new faces lurking in the abandoned French Quarter, normal needs a new definition.

As the city murder rate soars, Adele finds herself tangled in a web of magic that weaves back to her own ancestors. Caught in a hurricane of myths and monsters, who can she trust when everyone has a secret and keeping them can mean life or death? Unless… you’re immortal.