The 35mm print of this film, part of the always excellent Cult strand at BFI Southbank, is also being screened on January 17th. You can find the full details here.
Chicago Reader review:
A weird but utterly fascinating film. Ostensibly a gothic chiller, this Peter Straub adaptation feels like a Technicolor spin on a German expressionist film, suggesting cinematographer Jack Cardiff was poking fun at horror-cinema conventions. Director John Irvin is a strange case; he's directed some stylistically transgressive genre movies (City of Industry, Raw Deal) as well as some outright duds, but he's rarely uninteresting.
Here (and above) is the trailer.