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And as further inquiries ensue, Barnaby and Troy are drawn to investigate the death eighteen months previously of Robert's former housekeeper, Emily Beavis.
The investigation reveals two very insular communities wedded to ancient traditions and suspicious of outsiders. When Nick Cheney, the film's director, is found dead by the use of the prop guillotine, the detectives have several motives to examine.Emily’s sister, Doreen Beavis, and witnesses Colin and Christine Cooper ( Imelda Staunton), may hold the key to the case.
A series of other incidents follow, including a remotely controlled bomb explosion where Causton mayor Dave Hicks and his father Lionel narrowly escape with their lives, and the murder of Henry's son Johnny who is gunned down in front of his house.
Shortly afterwards, Nick's rival is murdered in an elaborate ritual using his own model of a medieval catapult, while his wife is forced to watch. When Serena is murdered while modelling one of her dresses at a wedding fair fashion show, Barnaby and Winter find a new link between the two victims.