Fighting Fantasy #11: Howl of the Werewolf by Steve Jackson (author) and Ian Livingstone (author)

Lupravia is a cursed land: a chill place of snow-capped mountains, brooding forests and mist-shrouded moors, haunted by the restless spirits of the dead. Only the foolhardy or mad would willingly pass its borders and enter that benighted realm of predators. But enter you must, after a vicious wolf attack sets you on the path to murder and madness. Succumbing to the call of the wild and the beast within, you must find a cure for your sickness before the next full moon. But how long can you survive in a land where the powers of darkness hold sway, dominated by the werewolf’s terrible howl?