Book excerpt: The classic serial, invented by BBC Radio Drama sixty years ago, survived and adapted itself to television, the arrival of colour and the global market in what has become a flood of classics with all channels competing for ratings and overseas sales. This richly detailed book traces these developments and analyses the genre's response to social, economic, technical and cultural changes, which have re-shaped it into the form we recognise today. The book contains considerable interview material with performers and media professionals.