Magic Bites by Ilona Andrews (Kate Daniels Series Book 1) is currently $1.99 in the US
https://www.amazon.com/gp/product/B009KUX7J2
https://www.kobo.com/us/en/ebook/magic-bites-1
Kate Daniels is a down-on-her-luck mercenary who makes her living cleaning up magical problems. But when Kate’s guardian is murdered, her quest for justice draws her into a power struggle between two strong factions within Atlanta’s magic circles. Pressured by both sides to find the killer, Kate realizes she’s way out of her league—but she wouldn’t want it any other way…