Second paragraph of third chapter:

“Do you think there was anything in the quarry?” said Susan.

I had read this years ago, of course; it is the sequel to Garner’s first book, The Weirdstone of Brisingamen. I see a lot of online reviewers saying that they like The Moon of Gomrath better; I must admit that I still have sharp memories of The Weirdstone of Brisingamen, and it must be thirty years since I last re-read it. Still, The Moon of Gomrath is a great fantasy story, with the young protagonists sucked into epic battle with ancient magical forces across the richly depicted landscape of Alderley Edge and Macclesfield. It’s not long since I was near that part of the world myself. You can get it here.