This episode is about a group of people interested in horse racing and a horse.
They all own the same horse. Some want to sell the race horse and some don't. The horse starts acting funny so he is removed to a farm that takes care animals for free. He is put there for his safety.
During the process of the story there are many characters, all angry and some hate each other. There is a young boy who is intensely interested in games on the computer. He plays with a man named Jeffrey as his opponent in a medieval game.
A doctor gets murder and several others all in the same way. They are all killed the same way and their mouth is tied with a rag to make a statement to those who find the victims.
This show like many of Midsummer Murder is very violent. Barnaby questions the boy as to why he plays such a violent game and the kid responds that it is only a game.
In the end Sergeant Dan Scott who replaced DSi Troy in Season 7 says to Barnaby that he does not understand how a person can turn murder into a game-- Barnaby replies "When killing becomes entertainment we all seem to lose touch with reality." I think that statement says it all. Many of the so police series like, CSI: Crime Scene Investigation and more are series about murder. They are for "entertainment".
Government representatives then wonders why people kill other people. They want to blame the method used like guns. I think, and this is my opinion is that everything can be turned into a murder weapon when gullible people, unhappy people see the results of a murder and how to plan one.