Britain's best-loved detective series enters a new era as DCI John Barnaby (Neil Dudgeon), a cousin of the original detective, moves in to fight crime in the beautiful but deadly villages of Midsomer. Midsomer Priory houses the nuns of the Order of St. Mathilde, a community which has very little to do with the outside world. When one of the nuns is found murdered, the Priory has to open its doors to the world of modern policing. Barnaby and Jones discover that the Priory is subject to a Deed of Trust and will house the Order as long as there is a community living there. When the community no longer exists it reverts back to heirs of the benefactor. Will Barnaby find the heirs and can the motive for murder be that simple?