On December 12, 1866, 361 men and boys were killed in an explosion at the Oaks Colliery in Barnsley, South Yorkshire, UK. Despite being the world's worst industrial loss of life in the 19th century, it remained relatively unremembered until 2015, when a group of ex-miners, trade unionists, and local historians attempted to raise money to erect a memorial for its 150th anniversary. But first, they had to find out what happened, and to whom, and whether anybody cared. The film tells three interlocking stories: the story of a historical community devastated by the disaster, struggling to survive; the story of a contemporary community, decimated by the loss of industry, rediscovering itself in the struggle to remember; and the story of a sculptor, struggling to make one last masterpiece.