In sonata for harp and bicycle do the characters change?

In "The Sonata for Harp and Bicycle" by Joan Aiken, the main characters, a young woman named Daisy and a young man named the Harpist, do experience subtle changes throughout the story. Daisy evolves from a practical, somewhat skeptical individual to someone open to the possibilities of love and the supernatural, while the Harpist transforms from a somewhat aloof figure into a more emotionally engaged character. Their experiences together ultimately lead them to a deeper understanding of each other and themselves, highlighting themes of love and connection.