Silver Borne - Patricia Briggs - paperback

Mercy Thompson, 5 book  of 14 ongoing series

When Mercy Thompson, mechanic and shapeshifter, attempts to return a powerful fae book she previously borrowed in act of desperation, she finds the bookstore locked up and closed down. 

It seems the book contains secrets and the fae will do just about anything to keep it out of the wrong hands. And if that doesn't take enough of Mercy's attention, her friend Samuel is struggling with his wolf side, leaving Mercy to cover for him lest his own father declare Samuel's life forfeit. 

All in all, Mercy has had better days. And if she isn't careful, she may not have many more.