Jones is not plural, so it should be Jones’s. ↩︎
I read this because I happened on an article about it on Tor.com: ‘Diana Wynne Jones’ The Time of the Ghost Breaks All the Rules of How To Write a Book’, by Emily Tesh. Let’s ignore the incorrect possessive apostrophe in the title1; it was the assertion about it breaking all the rules that drew me, made me want to read the article. A few paragraphs in I realised that I wanted to read the book, and the article was heading deep into spoiler territory. So I stopped reading it and downloaded the book. Read it as soon as I finished the last one.
It’s the story of four neglected sisters, whose parents run a boys' boarding school and have no time for anything else, including their daughters; and of a ghost that is haunting them, and who might be one of them. And of an ancient darkness that the sisters accidentally invoked.
But the real darkness is the neglect.
Highly recommended, and the article I linked above is very good and insightful (but deeply spoilerific) too.