The Ghoul-Peter Cushing-,John Hurt-1975 IMDB 5.3/10

A former Priest named Dr. Lawrence harbors a dark and horrible secret in his attic. The locked room serves as a prison cell for his crazed, cannibalistic adult son, who acquired his savage tastes in India during his father's missionary work there. Lawrence fears that his son will escape to prey upon the effete guests at his rural English estate during a cross-country auto race.