Margaret Gunn, raped by a psycho in a wolf's costume in Return of the Werewolf, gives birth to an unusually ugly child. He grows up to become a loner, a bully and finally a murderer, as he slices up his headteacher at the age of fifteen. While in gaol he discovers he is a werewolf and on his release the murders start again.
Used availability for Guy N Smith's The Son of the Werewolf
August 1978 : UK Paperback
December 2010 : USA, Canada, UK Kindle edition