Disturbing things have been happening up in the French mountains; more and more sheep are being found with their throats torn out. The evidence points to a wolf of unnatural size and strength. However Suzanne Rosselin thinks it is the work of a werewolf. Then Suzanne is found slaughtered in the same manner. Her friend Camille attempts, with Suzanne's son Soliman and her shepherd, Watchee, to find out who, or what, is responsible and they call on Commissaire Adamsberg for help.