After nuclear disaster, Rowenna and her young son are among the rare survivors in rural north-west Wales. Left alone in their isolated hillside cottage, after others have died or abandoned the towns and villages, they must learn new skills in order to remain alive. With no electricity or modern technology they must return to the old ways of living off the land, developing new personal resources. While they become more skilled and stronger, the relationship between mother and son changes in subtle ways, as Dylan must take on adult responsibilities, especially once his baby sister Mona arrives.