Who Killed Cock Robin?

An Irish stranger vanishes after being knocked down on his way home from an evening's drinking.<br> Barnaby discovers the visitor to be Sean O'Connell, a disgraced vet turned horse whisperer.<br> His search brings him face to face with an old adversary Melvyn Stockard who's daughter is about to be married, however, when the body of the best man's father is found in the well the wedding looks to be in jeopardy. It is no secret that Stockard was opposed to the marriage but would he murder to stop it going ahead?