Davey Fenwick (Sir Michael Redgrave) leaves his mining village on a university scholarship intent on returning to better support the miners against the owners. But he falls in love with Jenny (Margaret Lockwood) who gets him to marry her and return home as local schoolteacher before finishing his degree. Davey finds he is ill-at-ease in his role, the more so when he realizes Jenny still loves her former boyfriend. When he finds that his father and the other miners are going to have to continue working on a possibly deadly coal seam he decides to act.