The Master Blackmailer 1992
Holmes and Watson attempt to break the grip of a ruthless blackmailer of their clients
Demons of the Mind (1972)
A physician discovers that two children are being kept virtually imprisoned in their house by their father He investigates, and discovers a web of sex, incest, and Satanic possession
The Stalls of Barchester (1971)
While cataloging the library of Barchester Cathedral, a scholar finds a diary detailing the events surrounding the mysterious death of an Archdeacon some 50 years earlier The first of the BBCs famed A Ghost Story for Christmas