This film is notable because it's the only color film Lugosi ever made.
The entire plot is very confusing (in the vein of "the Gorilla") and a lot of the "thrills" are done for their "creepy effect", without any real explanation for some of them.
Even so, the floating green mask at the window, secret panels, disembodied heads and other things provide an "undercurrent" of an eerie mystery.
It's also interesting that Zucco & Lugosi are in this film; to my knowledge, they never made another film together.
It's a difficult film to find, but see it if you have the chance!
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