Prequel to Jane Eyre
I haven't seen Wide Sargasso Sea for several years but I remember that it was quite good and thought-provoking.
If anyone has read the book or seen the movie of Charlotte Bronte's gothic novel "Jane Eyre", I'm sure you are familiar with Edward Rochester as he appears in that story. A lonely middle-aged man (in England) who hires a tutor/nanny for his only daughter. Jane Eyre is the young English tutor and she assumes that Rochester is a widower, but she later learns that his wife is alive (hidden away and hopelessly insane).
Wide Sargasso Sea tells about Rochester's early years as he met and married his wife, and her sanity slowly dissolves. It could not have ended any other way and nor could it have ended happily. Otherwise this story could not be a prequel to the Bronte book which was written a century before it. The writers did a nice job of telling this story and tying up the loose ends, but still keeping the mystery to the end.