A re-read of something I read at school, unexpectedly bringing back hot afternoons in the mobile overlooking the field, and our English teacher's bad imitation of a Welsh accent. Intense and emotional, with a lot of undercurrents surprising in a children's book. I felt most for Gwyn, who had a chip on his shoulder, but probably for a good reason. Alison and Roger tried to treat him as an equal, but never quite managed it, especially with the interference of Roger's father and Alison's (never seen) mother. The undercurrent of supernatural activity was almost incidental to the emotions and interactions between the three young people, but brought a spooky slightly surreal atmosphere to the whole thing.