Have you already read The Unlikely Pilgrimage of Harold Fry? This new novel is a companion - not really a sequel or a prequel, more like a parallel story - to that excellent book.
In that previous story, Harold is walking to see a terminally ill former coworker; this book is her side of the story. Since there were several big surprises toward the end of the first book, you'll think you know the story ... but Queenie's got an ace or two up her sleeve, too.
The news of Harold's walk affected Queenie greatly. She's spent years feeling guilty about what happened all those years ago, and she feels this may be her time to get it all off her chest. As she begins to write, we're introduced to some lively new characters (many are other hospice residents) and we see a different perspective on some people we met in Harold's story.
As with the first, this book is WONDERFULLY written and you'll be absolutely transported to her beach garden and the Well-Being Garden as Queenie observes the passage of time and the healing balm of nature.
I don't know if this book would be quite so enchanting if you haven't read the other one - I had a hard time "unringing the bell" of having heard Harold's story to imagine this as a stand-alone novel, but it might work that way, too.