The current lead character is DCI John Barnaby (Neil Dudgeon), who works for Causton CID. Dudgeon's character is the younger cousin of former lead character DCI Tom Barnaby (John Nettles). Dudgeon first appeared as randy gardener Daniel Bolt in the Series 4 Episode "Garden of Death". Dudgeon permanently joined the show in 2011 following Nettles' departure.
The stories revolve around the Barnabys' efforts to solve numerous murders that take place in the fictional English county of Midsomer.