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Series Twelve of Midsomer Murders premiered 19 March 2009, and concluded on 4 October 2009.

Main Cast
Name Portrayed by Occupation Notes
Tom Barnaby John Nettles DCI Causton CID
Ben Jones Jason Hughes DS Causton CID
Gail Stephens Kirsty Dillon WPC Midsomer Constabulary
Joyce Barnaby Jane Wymark Wife of DCI Barnaby
Cully Barnaby Laura Howard Daughter of DCI Barnaby Cully's only appearance in the Twelfth Series is in The Glitch 
George Bullard Barry Jackson Chief pathologist of Midsomer County.
Episodes
Ep ID Title Director Writer Air Date
12.1 The Dogleg Murders Richard Holthouse Andrew Payne 22 July 2009
Crisp's Folly, hole 13 at Whiteoaks Golf Club, is unpredictable to say the least. As Alistair Kingslake, Jerry Drinkwater, Ed Monkberry and Miles Tully approach the hole, Kingslake raises the stakes with a £1000 bet, Discovering his ball is not on the fairway, Kingslake enters the woods to find it. When Drinkwater follows a few moments later, he discovers his body beaten to death. Barnaby and Jones investigate and uncover some sinister secrets at the well-to-do club.
12.2 The Black Book Peter Smith Nicholas Martin 5 August 2009
Felicity Law approaches Anthony Prideaux to sell a painting she found in her attic by Midsomer artist Henry Hogson. Anthony tries to con her into selling it for a trifling amount, however Felicity is not one to be conned and offers the painting for sale by auction. Despite Patricia Blackshaw's best efforts on behalf of the Hogson Society, she is outbid. When Felicity is found strangled and tortured, Barnaby and Jones investigate and learn a lot more than art.
12.3 Secrets and Spies Renny Rye Michael Aitkens 29 July 2009
Allenby House has become an MI-6 Safe house for visiting dignitaries and spooks. When Geoffrey Larkin, a guest at Allenby House, is invited to play in the local cricket match, old rivalries are rekindled and, as referee, it is up to Barnaby to keep the flames under control. When Larkin is found dead on the cricket pitch, Barnaby finds all avenues blocked by the official Secrets' Act and MI-6 red tape.
12.4 The Glitch Richard Holthouse Michael Russell 23 September 2009
Barnaby and Jones are investigating the infamous 'Bucketman' attacks, in which fast cars and their drivers are covered in red paint, most of whom work for Soft Earth Systems Inc. Meanwhile, George Jeffers has discovered a catastrophic glitch in the air traffic control system Soft Earth is launching, however Clinton Finn, the firm's owner, is determined to release the technology regardless. When an attempt is made on Jeffers's life, Barnaby and Jones step up their investigation.  Stephens transferred from uniform to CID becoming a DC.
12.5 Small Mercies Peter Smith Peter J. Hammond 28 October 2009
When a body is found in the quiet Midsomer village of Little Worthy, it is only the start of things to come. The mysterious murder triggers a dark series of events which see Barnaby and Jones uncovering affairs' tragedy and long-held family secrets. The busy body Compton sisters do not want to see the village change, however the tawdry web of relationships within the community lead to complications. with dire consequences. Are there one too many dysfunctional families in Little Worthy? Can Barnaby uncover the truth to protect the people of this 'model' village?
12.6 The Creeper Renny Rye Andrew Payne 27 January 2010
Midsomer has been hit with a wave of burglaries by a master house-thief who defies even stringent home security and has been dubbed 'The Creeper'. It is only when the Chief Constable is on the receiving end that Barnaby is called into action and, when a body is found, the investigation moves from petty theft to personal agendas. Barnaby is convinced there is more to discover, unravelling the long-standing social affairs and gentry and gangsters alike in his quest to stop 'The Creeper'.
12.7 The Great and the Good Richard Holthouse David Hoskins 14 April 2010
Preparations are in full swing for the village's annual fundraising evening, Frobisher night. However, Connie Bishop, chairman of the Frobisher Charity Committee and regular sleepwalker, is convinced she has an intruder and frequently disturbs the peaceful village screaming for help. She confides to Barnaby that she may have been dreaming but other villagers have seen someone loitering. When a body is discovered at the end of Connie's garden, Barnaby and Jones must get to the bottom of this disturbing mystery before anyone else is killed.


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