Carrion City duology

"Julie is a coked-up, burnt-out thirty-year-old whose only retirement plan is dying early. She's been trying to establish herself in the NYC magic scene, and she'll work the most gruesome gigs, exorcize the nastiest demons, and make deals with the cruelest gods to claw her way to the top. But nothing can prepare her for the toughest job yet: when her best friend, Sarah, shows up at her door in need of help. Keeping Sarah safe becomes top priority....