The detective Luther must make cases against criminals while the murderer Morgan has a complicated relationship with him. The first series is composed of six episodes which ran in May and June 2010. A second series of four episodes aired on BBC One in June and July 2011, and a third was commissioned in 2012 composed of four episodes which aired in July 2013. A two-episode fourth series was broadcast in December 2015, and a fifth series of four episodes premiered on 1 January 2019. BBC Studios handled distribution for the TV series.