How well you will take to this book will likely depend on how much you were intrigued by the subplot of the first wife in Charlotte Bronte's Jane Eyre.
Jean Rhys provides a prequel here which fills in a back story for Bertha Antoinetta Mason who is here known as Antoinette Cosway which is her birth name before being given stepfather Mason's surname. The book initially takes place in Jamaica during Antoinette's upbringing during the time of slavery emancipation and tells the story of the traumatic breakdown of her family after which she is schooled by nuns. In the second part she meets her husband (who is left purposely unnamed, but who is the Rochester of Jane Eyre, although in this case not portrayed as a sympathetic and romantic character) and they go on their honeymoon during which their relationship breaks down due to suspicions fueled by Antoinette's supposed half-brother Daniel. A short coda takes us to England where we briefly meet housekeeper Grace Poole now guarding a not-stable Antoinette with a result that is well-known to readers of Jane Eyre.
Personally I enjoy re-imagined stories and alternative history types of novels so I quite enjoyed this book.