The Old Dark House (1963), produced and directed by William Castle.
This light, very silly comedy-thriller is nothing like the James Whale version: The Old Dark House (1932).
Some charm, mostly tepid. I've never warmed up to Tom Poston as an actor, but the film has points of interest:
Always good to see what William Castle was up to.
A collaboration with Hammer Films.
Strong British cast: Robert Morley, Mervyn Johns, Peter Bull (as twins!)
But mostly for Janette Scott, last seen in Crack in the World (1965). I don't know why, but I'm always looking out for her.
Rather good score by Benjamin Frankel, better than the film deserves.
The credits were drawn by Charles Addams and the whole project has an Addams Family quirkiness:
My DVD was without subtitles but did have old-style Closed Captions, if you know how to deal with those. Castle's Mr. Sardonicus (1961) was on the same disc but is also available on Blu-ray elsewhere.