Hell in a Head Gasket — G.A. Chase

When Sere Mal-Laurette escaped hell, she thought she'd left her demons behind her. But now that one has found his way through hell's gate, others are sure to follow. Then all hell will break loose. If Sere fails to contain the little soulless bastards, the loas of the dead will likely figure out her true identity. Then they'll be all over her soul, and she can kiss immortality goodbye. Moreover, someone needs to send the demons back to where they came from before they wreak havoc on the citizens of New Orleans. To prevent the demon doppelgängers from killing their human equivalents and taking over their lives, Sere will need the help of people she trusts -- and some she doesn't. It's time for her to embrace the badass demon hunter she was always meant to be. To do so, however, she'll have to quickly figure out the line between protector of humanity and murdering psychopath.