Retired actress Libby Sarjeant and her friend Fran are invited to investigate a house that is reputedly haunted. For once, Libby can be as nosy as she likes without ploughing straight into a murder investigation, for the only deaths here appear to have occurred more than 50 years ago. But someone alive today doesn't want them to continue and soon their own lives are in danger as they try to find out why a ghost should play Debussy ...