Premise: Jean Rhys, CBE ( ; 24 August 1890 – 14 May 1979), born Ella Gwendolyn Rees Williams, was a mid-20th-century novelist who was born and grew up in the Caribbean island of Dominica, though she was mainly resident in England from the age of 16. She is best known for her novel "Wide Sargasso Sea" (1966), written as a prequel to Charlotte Brontë's "Jane Eyre".
Hypothesis: Jean Rhys had many unpublished novels.