Alma Katsu writes horror as well as espionage thrillers, and this one started with a really good premise: imagine if the Nazis with their “Werwolf” resistance movement at the end of the Second World War had used … actual werewolves! But the story takes place in just one tiny village, revolving around one fairly uninteresting family, and goes nowhere — as did the actual Werwolf resistance movement, which never amounted to very much.