Blood Bound

I just finished Moon Called and am now reading Blood Bound by Patricia Briggs. This is one of my favorite series. Here is the summary from the back cover.

Under the rule of science, there are no Witch burnings allowed, no water trials or public lynchings. In return, the average law-abiding solid citizen has little to worry about from the things that go bump in the night. Sometimes I wish I was an average citizen...

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...