The fictitious Cornley Polytechnic Drama Society (Cornley University in the American version), fresh from such hits as Two Sisters, The Lion and The Wardrobe, Cat, and James and the Peach (or James, Where's your Peach?), has received a substantial bequest and is putting on a performance of The Murder at Haversham Manor – a 1920s murder mystery play, similar to The Mousetrap, which has the right number of parts for the members. The script was written by the fictitious Susie H. K. Brideswell.