Baron zorn robert hardy believes his son emil shane briant and daughter elizabeth gillian hills are suffering from a madness they inherited from their late mother. He keeps his children locked up, but at night emil is released and murders women in the local village. Discredited psychologist falkenberg patrick magee dementia 13, the masque of the red death analyses the family and it transpires that the children witnessed their mother cut her own throat. The villagers, driven on by a manic priest michael hordern identify zorn as the 'demon' responsible for killing their daughters. The deranged emil escapes with elizabeth, but the murderous zorn pursues them. Blood, he vows, will have blood...one of the most ambitious and unusual horror films produced by hammer, demons of the mind was directed by peter sykes venom, to the devil a daughter and released in 1972. The distinguished cast includes shane briant, who would go on to appear in three further films for hammer.extrasnew featurette blood will have blood inside demons of the mindoriginal trailer