The Beast Within — Jane Jensen

WOLF'S BANE

American horror novelist Gabriel Knight finds himself in Germany, the reluctant heir to an ancient castle and an even older responsibility: as the "Shadow Hunter," it is his sacred trust to protect the innocent from the evil that lurks just beyond human understanding....

A string of brutal murders has Munich police baffled, but the locals know who--or, more precisely, what--is behind the killings: a werewolf. The trail of blood and violence leads straight to a members-only hunt club, whose charismatic leader inexplicably takes Gabriel under his wing and invites him behind the secret society's closed doors.

Too late, the Hunter realizes that he is now the prey. Tormented by the siren call of an unholy desire, Gabriel must face his greatest enemy--the beast deep within his own soul....