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.

• 1 - Diwedd
• 2 - Lloc 9
• 3 - Ambiwlans
• 4 – Claddu’n fyw
• 5 – Y Pedwar Marchog
• 6 - Y Lôn Ddu
• 7 - Pydew
• 8 - Dociau
• 9 - Y Dyfrwyr
• 10 - Gilead
• 11 - Yr Heliwr
• 12 - Dechrau