The death-cap dancers

From the webpage gladysmitchell.com: "While en route to visit relatives, Hermione Lestrange falls into company with three agreeable women who are spending their autumn holiday in a forest cabin. Out for a drive, the group discovers a battered bicycle by the side of the road, and closer inspection reveals the unfortunate owner, seemingly dead from head wounds, her body found in a nearby ravine. The police are contacted, but Hermione becomes concerned that suspicion may fall on herself and her new acquaintances, as the scene resembles a hastily covered-up automobile accident. Fearing the worst, she rings up her great-aunt and voices her fears.

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The young women are ultimately exonerated, but in a quite unforseen way: there is a second murder, and an attempted third, and each of the victims or near-victims (including the roadside casualty) is a member of a touring folk-dancing troupe staying at a local hostel. The newest attacks occured after a performance of hornpipe- and morris-dancing, which Hermione and her friends had attended. One dancer was set upon and her body pushed into a broom closet; another troupe member--a man still wearing a lady's wig to replace the absent cyclist in dances--was knocked unconscious and left for dead in the bushes outside. While Inspector Ribble concentrates his investigation on the movements of the folk-dance group, Dame Beatrice Lestrange Bradley considers a longer list of suspects. The Home Office psychoanalyst also imagines a wider range of scenarios than her more dogmatic police counterpart, some of which put Hermione and her friends in danger. Sending her great-niece (and her group) back to her father's pig farm in Stanton St. John, Dame Beatrice builds the case study of a very disturbed individual--someone who takes pleasure in pushing the death-cap mushroom into a victim's wounds."