Gunmetal Magic by Ilona Andrews

After being kicked out of the Order of the Knights of Merciful Aid, Andrea’s whole existence is in shambles. All she can do is to try to put herself back together, something made easier by working for Cutting Edge, a small investigative firm owned by her best friend Kate Daniels.

When several shapeshifters working for Raphael Medrano—the male alpha of the Clan Bouda and Andrea’s former lover—die unexpectedly at a dig site, Andrea is assigned to investigate…and must work with Raphael. As Andrea’s search for the killer leads her into the secret underbelly of supernatural Atlanta, she knows that dealing with her feelings for Raphael might have to take a back seat to saving the world…