One of the best series I've watched as it is full of atmosphere, connecting past and present in the streets of Whitechapel. The two main characters are fantastic opposites who fight grisly crimes with the help of the quirky self appointed Ripper expert. It is genuinely one of the most creepy series and it is such a shame that series 5 never materialized as it was obviously the one where some of the underlying mysteries would have been explained. That said, the lack of series 5 does not in any way take away from what is a fantastic, mystery crime series.