© ITV/Mark Bourdillon

Journalist Eve Lomax is murdered as she watches a cult 60s horror film starring Midsomer’s own Stella Harris. Colin Yule opens the inaugural Midsomer Langley film festival by showing the same film. But Stella’s evening is eclipsed by the dramatic arrival of her sister Diana Davenport, a Hollywood superstar. Diana and her producer husband Cy are reunited with their son Scott, who fled the family home to live in Midsomer. He is not pleased to see them.


Eve’s landlord Patrick Tilman tells Barnaby that Eve was writing a book on the sisters. Barnaby is suspicious of Patrick, as is his wife Juliet, who runs an organic vegetable delivery business. Meanwhile Kate discovers Eve had two puncture wounds in her neck, as if she was killed by a vampire, just like the film.


Stella’s daughter Emma is having a relationship with toyboy Perry Stevens, a delivery driver for Juliet. Emma’s unimpressed by Diana’s arrival, unlike her own star-struck daughter Rosie. Meanwhile Diana begs Stella to end their 40-year rift. Colin reveals that he’d helped Emma with her book but things turned sour when she refused his request for a consultancy fee and a treasured rare photograph from his collection went missing.


As Cy and Diana prepare to host a party, Scott fights with his father about leaving home. Then Barnaby discovers Cy had taken out an injunction to prevent publication of Eve’s book. He’d also been calling Eve and his leased Jaguar was seen at her house.


At the party, Cy falls from the stairs and crashes to the floor. It looks like a stunt but there’s a dagger in his back – chillingly reminiscent of another film, produced by and co-starring Cy. Stella admits she longed for revenge when Diana stole her part in a film, a move that ended her career.


Jones finds a pair of Diana’s knickers at Colin’s house, and he admits stealing them at the party. Then the detectives discover Perry has form for supplying drugs. Are his veg deliveries a cover?


Colin plans to take over writing Eve’s book but Stella warns him it could be dangerous. That night, he becomes the next victim, swathed in bandages like a mummy, replicating a scene from Stella’s film The Mummy Rises. The last person he phoned was Perry.


Meanwhile, the missing photograph turns up at Eve’s house. Stella admits it was from a film which was never completed but seems very hazy about the date. Jones follows Perry on his rounds and finds he is offering extra ‘services’ to his female customers. His next stop is the Barnabys’ house!


Emma crashes her Land Rover. The brakes have been tampered with, just as in Stella’s film The Torment about evil twins. But she’s alive. Barnaby guesses that Diana is Emma’s real mother and that Eve, like him, worked it out from the photograph and was planning to reveal all in her book.


Stella tells her daughter the truth, then Emma leaves the hospital mysteriously with Diana. Barnaby fears another murder will be committed, but the only remaining film is the one Diana ‘stole’. The detectives head to the church to confront Emma, Diana and Stella. But which of them is the killer?