Mysterious lights are seen in the sky over famous UFO hot-spot Cooper Hill. When a local forest ranger suffers a strange death, the visiting UFO spotters are convinced aliens are responsible. DCI Barnaby and DS Nelson unearth suspicions, betrayals and long-buried secrets in their search for the truth.
Mysterious events and the discovery of his relative's body lead the residents of Aspern Tallow to believe that Jonathan Lowrie's ghost is at large in their community. DCI Barnaby and DS Troy attempt to determine whether these strange occurrences are supernatural or if there is a more rational explanation.
The naked body of a young woman is found strangled in a local woodland nine years after three identical murders took place there. As DCI Barnaby and DS Troy investigate the killings, they are led further and further into the murky, clandestine world of Midsomer Worthy.
The Barnabys plan to renew their wedding vows for their 25th anniversary when Tom is distracted by a murder of a dying man committed with an Indian sword in Badger's Drift.
A row between keen birdwatchers in Midsomer-in-the-Marsh turns nasty when their president is killed. Patrick Morgan met his death while hoping to sight a rare bird, but is his obsession with ornithology to blame - or something more sinister? Barnaby and Jones attempt to discover the truth.
When a farmer is found horribly murdered in the middle of a stone circle, suspicion points at a group of druids. DCI John Barnaby and DS Jones hurry to the scene of the crime, where they are joined by new pathologist Kate Wilding on her first assignment. Druid high priest Leticia Clifford shows Barnaby that sacred ley lines run through the stone circle and later is convinced she has made an exciting discovery.
When a young female member of a new age cult called The Oblong Foundation goes missing, DCI John Barnaby investigates and sends DS Jones undercover at the cult's base, Malham Hall. The police learn that the hall's previous owners, the Lamberts, died in a gas explosion on board their boat. Barnaby and Jones must try to find out what really happened to the Lamberts - and whether the case has a link to the missing woman.
When a young woman is found dressed like a bride and drowned in a bath, it triggers a spate of ghoulish wedding-themed murders in Great Worthy. The case takes Barnaby and Jones to a donkey sanctuary, a heritage steam railway and a pub run by an ex-copper and former brothel madam. Could history be repeating itself?
A social services investigator calls on elderly eccentrics William and Mary Bingham, but he is sent away rudely by their daughter Selina and her husband Eddie Stanton. Artist Maggie Viviani also had a run-in with the investigator, so when his body is found in the river, they all come under suspicion. Barnaby learns that the Binghams never recovered from losing their elder daughter and son in a drowning accident.
DCI Barnaby uncovers an elite Mafia-like sect called the Pudding Club at private boys' school Devington College while investigating a murder, and must get to the bottom of the mystery before another victim turns up dead.
DCI Barnaby investigates the murders of bell ringers from the village church who are being mysteriously murdered one by one. Barnaby and Troy find that they must solve a riddle from the past before the killer strikes again.
When the body of arrogant local beauty Melissa Townsend is discovered by the pool at her manor house, DCI Barnaby uncovers a seedy world of adultery and deceit within the affluent rural community.
When a woman is crushed to death by a giant round of cheese at the home of the world-famous `Midsomer Blue' Barnaby and Jones are soon on the case. Debbie Moffett worked at the dairy, founded by her colleague Jim Caxton, who seems more anxious about his precious cheese than Debbie's death and later, Debbie's lover Oliver Ordish is garrotted with cheese wire and covered with cheese fly larvae.
When convicted murderer Grady Felton returns to the village where he killed a boy years earlier, his arrival is met with anger from the locals. Soon afterwards, a barrister is killed in Midsomer and suspicion falls on Grady. Grady has a solid alibi, but Barnaby suspects that he is working with an accomplice - until Grady himself is targeted in an arson attack.
Barnaby and Jones investigate when the appearance of a headless horseman at Quitewell Hall foreshadows a number of deaths among an aristocratic family called the DeQuettevilles. Meanwhile, the family stage a Civil War re-enactment with their hostile neighbours and relive historic battles. Can the detectives uncover the truth about the DeQuettevilles and the ghostly rider in order to prevent more murders?
It's Christmas and the troubled Villiers family get together nine years after the death of eldest son Ferdy, a magician. A riddle in a cracker predicts that two people will die before midnight on Boxing Day, then the frail Lydia Villiers is hospitalised after a fall. As Barnaby abandons his Christmas lunch with the in-laws to investigate, it seems as though ghosts from the past are haunting the household.
The revival of a traditional festival at Midsomer Parva ends in tragedy when the curate, the Rev Alex Dakin, is burnt alive inside a straw effigy of a woman. Then his gay lover the priest, the Rev Jim Hale, dies too.
When a prize-winning author is murdered on the eve of a literary festival, Barnaby and Scott discover a hotbed of corruption, scandal and financial mismanagement in the community of Midsomer St Michael. Before they can discover who is telling the truth, the death toll begins to rise.
Womanising landowner Gareth Heldman is killed by a violent blow from a Celtic spear, reawakening memories of a tragic archaeological dig at the ancient mound of Midsomer Barrow.
Sergeant Dan Scott arrives to work with Barnaby and is thrown straight into a murder investigation in Midsomer Mallow. A noise heard near the scene of Fiona Thompson's bloodstained body leads police to suspect an odd-job man, but when the murder toll rises, Barnaby becomes concerned for Cully, who is organising a ten-year school reunion.