Gray Dawn by Hailey Edwards

In this tenth and final installment of The Black Hat Bureau series, Rue races the clock to find her little moth girl before it’s too late. As much as she wants to believe that Clay will protect Colby, he isn’t himself when he’s under the director’s thrall. And the director would toss a loinnir back like a shot of pure magic if he got his hands on her.
As if Rue doesn’t already have enough heaped on her plate, Luca is spreading her poison west in a twisted game of take-out roulette. Now Rue must decide if saving one life is worth sacrificing the dozens of innocents Luca will kill if Rue doesn’t make stopping her the top priority.

As the director, Rue ought to put her agents’ lives and the Bureau’s purpose above her own, but Colby is her child and—right or wrong—Rue would burn down the world to save her.