The voiceovers were confusing. The guy who is supposedly rating these killers hardly says anything. And the other professionals who experiment, observe and draw conclusions about raw human emotion sound neither scientific nor excited about their work. Instead, a jumble of phrases, crime scenes (old/new/blurry/unidentified), and interior settings are strung together in such a way that I honesly couldn't figure out what the point was. Crime documentaries should draw the viewer in by setting up a mystery, whether that is a scientific mystery, a social conundrum, or a murder on the street. Then provide clues that lead to an aha! Moment. This show is anticlimactic from the first to the last scene of each episode. I have watched many, many excellent crime shows -- this is not among them.