Each day, inhabitants of a small community in the French Alps find another of their ewes with its throat cut. When one of the villagers too is killed people begin to wonder: could it be the work of a werewolf? Soon suspicion falls on Massart, one of the villagers, because of his beardlessness (according to popular legend, werewolves have no hair on their bodies because they are inside the body).|
Soliman, the victim's adopted son; Le Veilleur, a lonely sheperd and Camille, a lovely girl from the city, decide to pursue Massart and their hunt leads them into the Alps, but their incompetence is undisguisable and they decide to summon Commissaire Adamsberg — well known for his peculiar investigation methods — to help. Thanks to his extraordinary intuition, Adamsberg unearths an astonishing truth, one that the villagers are going to find hard to believe.