The Demon Trapper's Daughter, by Jana Oliver. Book I of the Demon Trappers Series
Set in a future Atlanta, the Demon Trappers books combine a bleak, bankrupt future with elements of urban fantasy--demons, magic and the walking dead. The premise sounds dark, but the series is actually a fun, fast-paced read starring seventeen-year-old Riley Blackthorne, whose job involves hunting and trapping demonic pests. The series is marketed as young adult, but it's winning many adult readers.