Demons Of The Mind. 1972.
A doctor discovers a baron who keeps his children imprisoned and uncovers other darker secrets.
From the Hammer studio this isn't a horror as such but more dark psychological suspense chiller, Robert Hardy plays the Baron who thinks his children Shane Briant and Gillian Hills have inherited some madness that their mother suffered which resulted in her suicide. Patrick Magee stars as the doctor called in to assess them and discovers more than just madness but also incest and satanic worshiping.
The baron house does seem like your typical Gothic house and atmosphere with plenty of places to run and hide. The plot does seem a bit messy and all over the place at first glance but given the chance for a second viewing this is a decent film to enjoy and understand.
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