All Things Under the Moon

"P. I. Teddy London never met a client as desperate and driven as Maxim Warhelski. The haunted European had devolted his life to one purpose: hunting down the killer who butchered his family. It happened on the first night of the new moon—a pattern repeated in similar massacres in Russia, India, and Afghanistan. Now, after a lifelong quest, Maxim wants Teddy London to help him track this human monster ... There's just one problem: The track belong to a wolf" — quoted from the Berkley Prime Crime mass-market paperback's back cover.