A String in the Harp
by Nancy Bond
Twelve-year-old Peter Morgan is not happy about being uprooted from Massachusetts and
hauled off to a tiny coastal hamlet in Wales, but he is fascinated by the ancient harp
key that he finds wedged between two cracks on a dike. Oh, did I mention that the key is
magic, letting him (and eventually other children) see the legendary Welsh bard Taliesin?
— Michael Main
I can tell you that the things you have seen and explained with reason could fit the
story of Taliesin, though your sister would rather not hear it.
A String in the Harp by Nancy Bond (Margaret K.
McElderry, 1976).