The Rivals of Sherlock Holmes (TV Show 1971) | The Horse of the Invisible (S01E05)

Episode 5: A ghost detective named Carnacki investigates the haunting of a country house that threatens the wedding of the homeowner's daughter and her fiance. Carnacki does not suspect supernatural forces are at work in this case, but even a ghostbuster can be wrong.

Author: William Hope Hodgson
Donald Pleasence as Thomas Carnacki, occult detective

Episode 6: https://rumble.com/v72dd70-the-rivals-of-sherlock-holmes-tv-show-1971-the-case-of-the-mirror-of-portug.html