After a miner is killed by a corrupt union leader, his son, an attorney, embarks on a quest for justice, unraveling a web of deceit and violence.

In the early hours of New Year's Eve 1969, in the small soft coal mining borough of Clarksville, Pennsylvania, longtime trade union insider Joseph "Jock" Yablonski and his wife and daughter were brutally murdered in their old stone farmhouse. Seven months earlier, Yablonski had announced his campaign to oust the corrupt president of the United Mine Workers of America (UMWA), Tony Boyle, who had long embezzled UMWA funds, silenced intra-union dissent, and served the interests of Big Coal companies. Yablonski wanted to return the union to the coal miners it was supposed to represent and restore the organization to what it had once been, a powerful force for social good. Boyle was enraged about his opponent's bid to take over and would go to any lengths to maintain power.