This film screens as part of the Projecting the Archive season at BFI Southbank. The movie will be introduced by film historian Jonathan Rigby. More details here.
Here is the BFI introduction: This atmospheric chiller takes little more than its title from the HP Lovecraft pastiche it’s based on, which is greatly improved by the reworking. Susanna Whately (Lynley) returns to the remote island off the US east coast that she left as a child, intending to reclaim her inheritance. Despite warnings of supernatural goings-on, she and her husband have more to fear from the local rednecks, led by a sleazy Oliver Reed, than the secret that lurks in the shuttered room.
Here (and above) are the opening titles.