Based on real events, this historical drama is set in 19th-century Ireland, when poverty-stricken tenants dispossessed by greedy landowner Capt. Boycott (Cecil Parker) band together to assert their rights. Patriotic farmer Hugh Davin (Stewart Granger) leads the rebels. Choosing nonviolent resistance, the villagers ostracize their nemesis, who squanders his fortune to repair his ruined reputation and wagers what's left on a horse race.

Determined, independent Bridie Quilty comes of age in 1944 Ireland thinking all Englishmen are devils. Her desire to join the IRA meets no encouragement, but a German spy finds her easy to recruit. We next find her working in a pub near a British military prison, using her sex appeal in the service of the enemy. But chance puts a really vital secret into her hands, leading to a chase involving Bridie, a British officer who's fallen for her, a German agent unknown to them both, and the police...paralleled by Bridie's own internal conflicts.