Ok ok, this isn't a teen book. I've been branching out.
Although, to be fair, other than the swearing and the violence...and actually because of it...it's still ok.
Mercy Thompson is a shapeshifter living in the area of a werewolf pack. She's a mechanic who deals with vampires, witches, and the fae...along with those pesky werewolves. So when a new werewolf appears at her shop looking for work, she doesn't turn him away even though she thinks about it. Mac's a pretty good kid but it's apparent he's never been trained by an Alpha on his new abilities.
Then two men appear and try to take Mac with them. Mercy steps in at that point and kills the werewolf--something she shouldn't really be able to do. Before long, the whole werewolf pack is involved, their Alpha is down, and Mercy is up to her neck in all sorts of supernatural trouble.
An involved story with lots of twists and characters. Mercy is a great main character--full of spunk and sarcasm. There is some romance in the story, but not a lot--just overtones. I love books with some paranormal aspect, some romance, and a lot of kicking a**. This book has all three..in spades.