Dau is a story about living and belonging, about secrets and fears, about trusting and doubting, but ultimately, about love and care. At its core is the sibling relationship between Wiliam and Gwen, two elderly twins, and through their eyes we witness the change experienced over many years within an established rural community.

Mae Dau yn nofel dawel, gynnil ac iddi ddyfnder profiad ac emosiwn. Stori am gynefin a pherthyn, am gyfrinachau a ffyddlondeb, am ofnau ac amheuon, ond goruwch popeth, am ofal a chariad. Stori'r ddau efaill Wiliam a Gwen, y ddau olaf o 'ddwsin dedwydd' fferm y Nant. Trwy eu llygaid nhw profwn y newid a welir ar yr aelwyd ac o fewn cymuned wledig sefydledig dros gyfnod o flynyddoedd.