Unbroken by Jordan L. Hawk

The hunt for the evil Books of the Bound nears its end, as Ves and Sebastian track an elusive killer who can raise the dead.

Librarian Sebastian Rath has Bound himself to three of the four necromantic Books created by his ancestors. Only the Book of Blood remains—and it’s in the hands of an elusive killer.
Someone is murdering members of the Widdershins Horticultural Society using the Book’s magic. In order to stop the killings and Bind the final Book, Sebastian and Ves must find their way through a forest of lies and deception. But the danger is closer to home than they think, and more than one killer has Sebastian in their sights.