How bad is it? It's a dull mystery posing as a horror film.
Should you see it? Probably not.
This film is notable only for being Bela Lugosi's only film in color and for being made in 1947, when not many horror films came out. George Zucco and little Angelo Rossitto also star. The film is narrated by a woman's corpse. A woman dies without any traceable cause, apparently frightened to death after seeing a mask of the face of a man she'd framed. There's a lot of red herrings and some hypnosis, but the film meanders; the director does well with the visuals (he was a director of silent films decades earlier), but doesn't do well with anything else.