Luther: Series 1-5 [DVD]All 20 episodes from the first five series of the BBC crime thriller starring Idris Elba as the brilliant but flawed murder detective John Luther. The detective sees it as his personal crusade to track down the depraved killers it is his job to identify. But as he struggles with personal demons of his own, his strong moral code cannot always be relied upon to protect him from the dangerous violence of his own emotions and passions.