Title: The owl service
First published: 1967
Description: Brilliant. Not at all clear that it's a children's book. An extraordinary re-creation of a myth in a way that explains how myths are created, and why they aren't just myths. 

During a summer vacation in a secluded Welsh valley, three young people find themselves driven by the spirits of three mythical lovers to reenact an ancient tragedy.
Subjects: Legends, Juvenile fiction, Space and time, Fiction, Adult fiction, repetition, Eternal triangle, Children's stories, Fiction, fantasy, general, Space and time, fiction, Whales, fiction, Children's fiction, Wales, fiction, Fiction, general
Places: Wales
Time periods: non-specific 20th century