Famous solo violinist Lucy Carless is making a guest appearance with the provincial Markshire Orchestra, only to be found strangled with a silk stocking part-way through the concert. Everyone in the orchestra had access to the scene of the crime, and the police officer in charge, Inspector Trimble, has no idea where to start. Luckily retired barrister and amateur detective Francis Pettigrew has been acting as an honorary treasurer to the Markshire Orchestral Society, and he is soon on his way to finding the murderer.