Su protagonista, hasta el año 2011, era el inspector jefe Tom Barnaby (John Nettles), que trabajaba para Caustron CID; más tarde, fue reemplazado por el actor Neil Dudgeon, que interpreta a un primo menor de Tom, John Barnaby. En cada episodio, Barnaby investiga uno de los numerosos asesinatos que ocurren en el condado ficticio de Midsomer, acompañado por un sargento, que fue cambiando durante la historia del programa: Gavin Troy (Daniel Casey), Dan Scott (John Hopkins) y Ben Jones (Jason Hughes).
The Dogleg Murders (Episodio 1) 7.8
Fecha de emisión: 2009-07-22
Duración: 92 min
Sinopsis: On the Midsomer Golfclub Whiteoaks a member is killed with a golfclub. In the course of the investigation they discover Whiteoaks to be full of hatred, gambling, violence, jealousy and extortion.
The Black Book (Episodio 2) 5.8
Fecha de emisión: 2009-08-05
Duración: 90 min
Sinopsis: The sale of a previously unknown painting by an 18th century painter sends Barnaby into an investigation of murders as well as art forgery.
Secrets and Spies (Episodio 3) 7.9
Guionista: Michael Aitkens
Fecha de emisión: 2009-07-29
Duración: 90 min
Sinopsis: A number of murders near a government safe house in Midsomer appears to be connected to a group of British spies stationed in East Berlin during the Cold War.
The Glitch (Episodio 4) 7.9
Fecha de emisión: 2009-09-23
Duración: 90 min
Sinopsis: Midsomer University science fellow George Jeffers threatens to make public a problem with his state-of-the-art invention Kernel Logic, but American software boss Clinton Finn fears he will lose millions if the truth comes out. When a schoolteacher is killed in a hit-and-run, Barnaby suspects Jeffers was the intended target.
Small Mercies (Episodio 5) 8.1
Guionista: Peter J. Hammond
Fecha de emisión: 2009-10-28
Duración: 90 min
Sinopsis: Richard Tanner is found murdered in a model village, stabbed and trussed up like Gulliver in a macabre tableau. The disturbing manner of his death leads Barnaby and Jones to suspect that someone in the village of Little Worthy is criminally insane.
As further gruesome killings rock the community, the detectives face a race against time to unravel past events that lead to the making of a dangerous serial killer.
The Creeper (Episodio 6) 6.4
Fecha de emisión: 2010-01-27
Duración: 90 min
Sinopsis: Midsomer's Chettham Park House, once owned by Sir William Chettham, has been bought by entrepreneur Jack Filby to save Sir William from financial ruin. Long-term friends dating back to the days of university, Jack has allowed William, his mother Elizabeth, wife Isobel and son Freddy to stay on living at The Dower House - the smaller house on the estate where the Baronet's widowed mother would traditionally live. Jack is the man of the manor now with William and Isobel's son Freddy as his right hand man.
The Great and the Good (Episodio 7) 8.1
Fecha de emisión: 2010-04-14
Duración: 90 min
Sinopsis: The night time peace of Badger's Drift is shattered horribly when teacher Connie Bishop screams in fright, convinced there is an intruder. Days later a local councillor, said to be obsessed with her, is found murdered in her garden. Is Connie the innocent victim she seems? Barnaby and Jones uncover jealous rivals, ruthless social climbers and a cottage with mysterious secrets as they search for the killer.
