Hen Blant Bach

Un rhyfedd yw Erful, yn byw bywyd unig. Yr unig atgofion hapus sydd ganddo yw'r rhai o'i gyfnod yn yr ysgol. Felly, pan gaiff un o'i gyd-ddisgyblion ei llofruddio, teimla ei bod yn ddyletswydd arno i ddatrys y dirgelwch. Rhaid iddo ymdopi â'r byd tu allan i furiau ei gartref, ac os yw am oroesi, rhaid i Erful fynd i'r afael â'i orffennol ei hun.

Erful is a strange and lonely character, and his only happy memories are those of his school days. When a former pupil is murdered, Erful feels that he has a duty to solve the case. In doing so, he has to venture from his familiar world, and grapple with issues from his own past if he wishes to survive.