Tonypandy, South Wales, 1911. Starving, striking miners fight soldiers and police on the picket lines for the right to earn a wage that will feed their families, while Irish labourers are brought in the take their place in the pits, for half their pay.
Handsome 'Big' Tom Kelly, an Irish worker, comes to Wales looking for a better life and believes he has found it when he falls in love with Amy Watkins, the daughter of a strike leader.
At night, the miners search out the Irish men, drag them from their beds, beat them and then hang them from the street lamp posts. Can Amy and Tom keep their love a secret forever? All they want is a future together. But in a world full of hatred, anger and violence, their dream seems impossible. Until another strike leader offers them a way out.