Starring Alan Davies as the eponymous mystery-solver and with Sheridan Smith returning as his sidekick Joey Ross, the 90-minute special - entitled The Clue of the Savant's Thumb - has been written by David Renwick, who created the show and who wrote all its previous episodes. It is to be made by BBC In-House Comedy for BBC One, with filming starting later this month.
In the story, Creek and Ross are drawn into a complex case involving a secret society, seemingly supernatural events at a girls' boarding school, and the miraculous disappearance of a body in front of three witnesses.
Pete Thornton, the creative head of BBC In-House Comedy, added:
No director has been announced yet, but it will be produced by Rosemary McGowan, with Pete Thornton as the executive producer.
Jonathan Creek first aired in 1997 and there have been four series and two specials so far. In 1998, it won the BAFTA for Best Drama Series. Julia Sawalha, who played the Doctor's assistant and love interest Emma in Steven Moffat's Doctor Who spoof The Curse of Fatal Death for Comic Relief in 1999, was Creek's assistant Carla Borrego between 2001 and 2004, while guest stars have included Peter Davison, Colin Baker, Paul McGann, Maureen O'Brien, Mary Tamm, and Geoffrey Beevers.