Murder in the Green — Lesley Cookman

Amateur sleuth Libby Sarjeant and her psychic investigator friend Fran become involved when a member of a local Morris Dancing side is found dead on May Day. Driven in part by her interest in Morris lore, Libby leaves her comfort zone in Kent and travels to Cornwall where she sees the darker side of Morris and its links to Satanism. Back home in Kent, she and Fran begin to unravel the facts behind the murder and the cleverness of a completely unsuspected killer.