Following their adventures in Yr Horwth and Melltith yn y Mynydd, the heroes of Copa Coch venture from their home for the first time, trailing the mystery that hides in the hills and marshes of the kingdom of Bryn Hir.
- ISBN13 9781801060851
- Publish Date 25 March 2022
- Publish Status Active
- Publish Country GB
- Imprint Atebol Cyfyngedig
- Format Paperback
- Pages 304
- Language Welsh