Killers of the psychic type are few and far between, which is probably for the best considering that my head would likely explode if there were one too many. Self-deprecating humor aside, it doesn't take a parapsychologist to figure out..
An investigation is like a puzzle. It requires a methodical approach as well as seeing the bigger picture, two qualities that Kurosawa stresses, as he is not only attentive to the mystery surrounding the murders but also to the unreliability..