Relates what happens to three American children, unwillingly transplanted to Wales for one year, when one of them finds an ancient harp-tuning key that takes him back to the time of the great sixth-century bard Taliesin.
General Note
Originally published: New York : M.K. McElderberry Books, c1976.
"Inludes a reader's guide for book groups, teachers, and students"--Cover p. [4].
"A Margaret K. McElderry book."