Hilda, Tom and Hywel all gather together to help Teilo Siencyn, the Prime Minister for Wales, to catch the monsters which cause chaos in the country. Thank goodness that Hywel has an old book specifically about monsters and ghosts.
| ISBN: | 9781847712264 |
| Publication date: | 4th June 2010 |
| Author: | Manon Steffan Ros |
| Publisher: | Y Lolfa |
| Format: | Paperback |
| Pagination: | 208 pages |
| Series: | Cyfres Yr Onnen |
| Genres: |
Children's and Young Adult Fiction |