What a disappointment!
As imaginatively designed as this film is, all the more remarkably so for having been shot before the beginning of World War II, I was still stunned by how poor it is. It plays like a badly directed version of The Twilight Zone. A fine cast screams its way through 3/4 of the film. The final sequence is marginally better, marginally being the operative word. It leaves little if any impact.
What a disappointment.