"The Bloodstained Butterfly" has an interesting way of showing us the investigation of a crime, but it's characters are bland and uninteresting and there is nobody to root for. It isn't made amateurishly, but that barely helps to make the movie more interesting and you will be constantly checking the remaining time up to the movie's somewhat predictable finale. 6/10! I recommend the movie only to hardcore giallo fans, but the rest should avoid it.