T12:C07 - S12:E07 - The Great and the Good

A sleep-walking school teacher (Nancy Carroll) starts to believe she has slit the throats of her mentor (Tim Wylton) and a local handyman man in her sleep, but her friends (Paola Dionisotti and Monica Dolan) are not convinced that she is the culprit, nor is Barnaby. A local philanthropist (Paul Chapman) and his social-climbing wife (Suzanne Burden) are planning the annual Frobisher night - but will it go without a hitch, and can they identify the killer?