Gwenno is dead - perfect, clever, beautiful Gwenno, who is popular with both swots and cool people. Her body was found in the slate mine, the police are everywhere around Bethesda, and everyone is looking for her. But they have no hope of finding her, as they have no idea what she was really like.

Mae Gwenno wedi cael ei lladd. Gwenno berffaith, glyfar, brydferth - hi oedd yn boblogaidd efo'r swots a'r bobol cŵl. Darganfuwyd ei chorff yn y chwarel, a bellach mae'r cops dros bob man ym Methesda, a phawb yn ceisio dod o hyd iddi. Ond does ganddyn nhw fawr o obaith, dim â hwythau'n gwybod y nesaf peth i ddim am sut ferch oedd hi go iawn.