Force by Susan Bliler

Arabella is the lone female officer on the Great Falls Tactical Force. To prove her merit, she volunteers for a mission that turns out to be more than she bargained for. Transported to the Crazy Mountains of Montana, Arabella’s world is rocked when she’s introduced to Keepers and their Soul Sentries.

Force BlackWolf is trying to adjust to his new life in Montana. Settled in a secluded hideaway dubbed the North Fortress, Force and his brethren are relying on Skin Walkers to help them adapt. As part of that adaptation, they require training. But when the soldier delivered to the Fortress to train them turns out to be female, all hell breaks loose.
Arabella becomes Force’s responsibility and in the midst of protecting her, other emotions rush to the fore, the strongest being desire.

Unsure if love can even exist for Keepers, Force is willing to risk everything for his shot at a life with Arabella.