Shifter by Rebecca Zanetti

He’s an alpha without a pack…She’s part of the deal
As the only living wolf pack member with the tiniest drop of alpha blood in her veins, Luna McElhanney is suddenly thrust into the spotlight. Normally content in her solitude, she’s fixated on defeating a deadly enemy in her lab, and now she’s the one being hunted. There’s only one solution, according to the pack, and that’s for her to mate Erik Volk and bring him into the fold.

Erik Volk has been fascinated by the petite wolf shifter from the moment he’d kidnapped her so she could help his family, which she cheerfully did. He’s dedicated to his job as the Enforcer for his brother’s pack, but the Alpha in him keeps yanking against the chains. When Luna falls into danger, he has no choice but to let the Alpha loose and become the Shifter they all should fear.