The detective drama revolves around DCI Barnaby's efforts to solve numerous murders that take place in the fictional English county of Midsomer. The current lead character is DCI John Barnaby, who is the younger cousin of former lead character DCI Tom Barnaby. The Barnabys have worked with several different sergeants throughout the run of the show, including Sgt Gavin Troy, Sgt Dan Scott, Sgt Ben Jones, and Sgt Charlie Nelson.

Clumsy Raif Moyle returns to Cheshire for the wedding of his elder brother Tim to Saskia, their old school-friend, who was something of a wild child in the past. To the mild consternation of Saskia's socially-conscious mother Alex Raif proposes that, in addition to his duties as best man, he will make a video of events leading up to, and including, the wedding. This means he spends a lot of time with Saskia and begins to realize that, beneath the surface, the happy event may turn out to be less than happy for all concerned. Fortunately a wedding does eventually take place with surprises all round, the biggest one coming from Alex.