Kin of the Wolf by Lindsay Buroker

Pack politics, adventure, and romance feature in the third installment of Magnetic Magic.
Luna has recovered priceless werewolf relics from powerful thieves, but they’re still alive—and they can control her new ally, a lone wolf named Duncan.
She would be wise to have nothing to do with him, but he’s handsome, charming, and keeps coming to her defense. Further, with certain members of the pack gunning for her, she needs his assistance. Her cousin Augustus is holding a grudge, and she’s going to have to find a way to deal with him—before he deals with her.