Supernatural - The Dogs of Edinburgh (2012)

Dean and Sam Winchester were raised as Hunters by their widowed father, seeking vengeance on the supernatural elements that took their mother from them. But the road to vengeance is a dark one, and is it a place where children can have any semblance of a life? On an academic break while at Stanford, Sam Winchester visits the United Kingdom on what is meant to be a sleepy trip. His first day he meets the hypnotic 'Emma of the Isles,' who takes him to a nasty part of town, where an even nastier evil lurks. This could be the very first team-up between European and American Hunters - but will it end in disaster?
Collects Supernatural Vol.4 #1-6