Edinburgh, 1736. In the town’s grim prison, the Heart of Midlothian, two prisoners await execution. Captain Porteous of the Town Guard has been sentenced to death for ordering his soldiers to open fire on Edinburgh citizens. He hopes for reprieve. The people want revenge. Effie Deans, wrongly accused of killing her newborn baby, will die unless her sister, Jeanie, tells a lie. Jeanie, determined to save her sister, makes a terrifying journey as Effie’s life hangs in the balance.