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.
- ISBN10 068950036X
- ISBN13 9780689500367
- Publish Date 1 January 1976
- Publish Status Active
- Publish Country US
- Publisher Simon & Schuster
- Imprint Atheneum Books for Young Readers
- Format Hardcover
- Pages 370
- Language English