The underground mine fires ravaging Pennsylvania coal country have forced eleven-year-old Brigid Howley and her family to seek refuge with her estranged grandparents, the formidable Gram and the black lung stricken Gramp. Tragedy is no stranger to the Howleys, a proud Irish-American clan who takes strange pleasure in the "curse" laid upon them generations earlier by a priest who ran afoul of the Molly Maguires. The weight of this legacy rests heavily on a new generation, when Brigid, already struggling to keep her family together, makes a grisly discovery in a long-abandoned bootleg mine shaft. In the aftermath, decades-old secrets threaten to prove just as dangerous to the Howleys as the burning, hollow ground beneath their feet.