Murder to Music — Lesley Cookman

In her eighth case, amateur detective Libby Sarjeant and her psychic investigator friend Fran Castle are invited to look into a house that is reputedly haunted. For once, Libby can be as nosy as she likes without being accused of getting in the way of a police investigation. However, when they unearth 50-year-old graves in the gardens, the police are bound to cramp their style. Someone alive today doesn't want them interfering either, and their lives are in danger as they try to unravel the mystery of a ghost who plays Debussy.