Rent Midsomer Murders: Series 13: The Sword of Guillaume (2009)

The Mayors of Causton and Brighton have agreed a deal for Causton to buy a plot of land in Brighton for the less fortunate of its residents. Barnaby is convinced the deal will benefit Causton's mayor more than its residents and so digs a little deeper, involving his cousin John Barnaby, the DCI in Brighton. When local business man Hugh Dalgleish is decapitated on a trip to Brighton, Barnaby finds himself investigating much more than dodgy deals.