a Hartswood Films production for BBC Wales in co-production with Masterpiece ; co-created by Mark Gatiss & Steven Moffat ; written by Mark Gatiss, Steven Moffat and Steve Thompson ; series producer Sue Vertue ; executive producers Beryl Vertue, Steven Moffat, Mark Gatiss, Bethan Jones ; directed by Jeremy Lovering, Colm McCarthy, Nick Hurran
EFTI ; in co-production with Filmpool Nord, Ljudligan, Sandrew Metronome Distribution Sverige AB, Sveriges Television and WAG ; produced by Carl Molinder, John Nordling ; screenplay by John Ajvide Lindqvist ; directed by Tomas Alfredson