The story is somewhat ordinary: "haunted" Scottish Castle, mysterious comings and goings, morose servants. Two women saying "I wonder where that door leads to." It turns in a bit of an unexpected direction, but all in all, the story and acting by themselves are worthless.
What makes this a recommended film is the way it is layered, its careful architecture. The reason is because the director was in fact a celebrated set designer/production manager. He thought in terms of spaces.
More: the thing was filmed in 3D. I did not see it that way, but the layering, the sense of containment was rare, and thrilling.
Readers often ask me about my notion of "architectural" films and I reluctantly send them to Welles' "Othello." But that film has other mysteries woven into it. Here, I have an example that is essentially pure.
One narrative device should be mentioned. We have a narrator that frames the thing, the way Ronald Reagan used to frame that TeeVee show presented by General Electric, and Hictcock did his show. She has the same manner, but herself is located spatially.
Ted's Evaluation -- 3 of 3: Worth watching.