June and Jennifer Gibbons are twins from the only Black family in a small town in Wales in the 1970s and '80s. Feeling isolated from the community, the pair turn inward and reject communication with everyone but each other, retreating into their own fantasy world of inspiration and adolescent desires. After a spree of vandalism, the girls are sentenced to Broadmoor, an infamous psychiatric hospital, where they face the choice to separate and survive or die together.

A politician's wife and the mortician who has secretly loved her for years plan to fake her death so they can run away together.

When an English cartographer arrives in Wales to tell the residents of the Welsh village of Ffynnon Garw that their 'mountain' is only a hill, the offended community sets out to remedy the situation.