When Debbie Moffett is crushed to death with a giant round of cheese at the home of the world-famous Midsomer Blue, secret and controversial plans to modernise the dairy are revealed while rumours about private lives of the parents cause a row at the prestigious Midsomer Pastures Prep School. As other people linked to the dairy meet agonising deaths, long-held secrets start to emerge.

Harriet Farmer wakes up after having been in a coma since the night she tried to elope, and her boyfriend Finn Robson has been missing since the couple tried to run away together a year before. But when a killer starts targeting members of a chess club shortly after Harriet wakes up, DCI Barnaby begins to wonder if the two cases are connected.

The murder of a journalist has chilling echoes of a 1960s horror film starring Midsomer's own Stella Harris. When Stella's more famous sister returns after a 40-year family rift, the killings escalate, each reminiscent of a movie plot.

DCI Barnaby and DS Jones investigate the murder of amateur astronomer Jeremy Harper, who was struck on the head with a piece of meteorite on an outing on Moonstone Ridge with the Midsomer Stanton Astronomical Society to observe a total eclipse of the sun.

When a barrister is killed in Midsomer, suspicion falls on convicted murderer Grady Felton who was just released from prison. But Grady has a solid alibi. DCI Barnaby suspects he may be working with an accomplice - until Grady himself is targeted in an arson attack.

When Bentham DeQuetteville falls to his death from the roof of Quitewell Hall after seeing a headless horseman, his aristocratic family seem more concerned about their forthcoming Civil War re-enactment than the incident. As DCI Barnaby and DS Jones try to find out the truth behind the ghostly figure, their investigation uncovers shocking secrets about the DeQuettevilles.