I should point out that mom did a great review of this book four years ago and I agree with everything she said. So I'll only add a few personal reflections.
This is a great ghost story, but not of the frightening variety. It's more about the secrets families keep from outsiders and also from each other. Although, in the case of The Thirteenth Tale there is a real "ghost" which keeps the story moving forward quite nicely.
I cared about both Margaret and Vida immediately, which made this an easy book to get into and stick with. The narrative doesn't let up until the very last page and even then, I wanted more. Also, the setting on the English moors was the perfect place to spend several rainy summer days being entertained by this delightful, engrossing tale.