Blood Bound (Mercy Thompson Series, Book 2)2007
(Blood bound)
by Patricia Briggs
Mechanic Mercy Thompson has friends in low places-and in dark ones. And now she owes one of them a favor. Since she can shapeshift at will, she agrees to act as some extra muscle when her vampire friend Stefan goes to deliver a message to another of his kind.But this new vampire is hardly ordinary-and neither is the demon inside of him.
— from OpenLibrary
9 editions at OpenLibrary