Vittle Arwel Vittle 
Cyfres y Dderwen: Y Ddinas ar Ymyl y Byd [EPUB ebook] 

Within the City walls there are cruel soldiers, corrupt businessmen, an ever-present Keeper, a girl with a secret mark on her shoulder and the secrets of the authorities. The Crisis and the Disease have left their mark and turned nature up-side-down. An imaginative novel for teenagers and adults in the Cyfres y Dderwen series by the author of
Dial yr Hanner Brawd.