PD James' 'Death Comes to Pemberley' and Jean Rhys' 'Wide Sargasso Sea' are two attempts to write a sequel or prequel to a much-loved classic. I read them both but couldn't enjoy them. It was similar to eating one of those 'lite' fat-free foods instead of nice real butter or cream. Most unsatisfying. I think authors are just trying to cash in on the originals, which many people haven't read anyway, so aren't likely to be upset.