I thought the series was excellent and watched it all in one evening....because of my life long career in R&D I tend to look for details in production that are flaws either in the story line or in production ..... The thing that stood out most for me was the fact that Cooper was allowed to have a dart board and darts in his cell. I assume that was director's license to remind the audience that the killer was a very skilled tournament dart player whose televised matches were key to his identification. But darts in the possession of a suspected killer????