Temptation of the Moon by L. S. Slayford

Where temptation leads, trouble awaits …
Out in the darkness someone is waiting for the perfect time to attack Luna and her werewolf brother. Mercenaries have failed to kidnap her previously, but she knows it’s only a matter of time before they make their move again. If they want to destroy the world, then they need her.
In the meantime, Luna is learning how to defend herself. She may be human but she’s not going down without a fight. Between her brother Michael, dark and sexy Chase, and the angelic-looking Pierre, she should be able to hold her own. After all, she’s already helped to fight off Fae, ghosts, and werewolves. What’s one more? That’s if she can stop drooling over Chase and Pierre and concentrate on honing her fighting skills.

But Luna is about to discover that there’s something far deadlier than all these supernatural beings combined.