A young American woman visiting her author father in London discovers that her childhood habit of sleepwalking has recurred. She has a vivid dream of witnessing a murder in a strange house - or is it a dream?
Rivalry at a local Gilbert and Sullivan Society over who will play Jack Point in the Silver Jubilee production. Rowland Matthews has always been the main star, but he is getting on, and the young Clive Bates is a strong rival.