John Watimer, public relations executive for international mining corporation Westlund Amecor, is offered a coveted promotion if he convinces four First Nations communities in Northern Ontario to grant his company permission to construct two underground uraninite mines beneath Lake Mameigwess. Dubbed "Rolling Thunder," the project means billions in revenue for the company, but the Oji-Cree fear the mines will pollute the watershed, upon which their culture depends. At the first public hearing, held at the island village of Nawadjiwon, John collapses from a heart attack. Hovering between life and death, he receives a powerful vision foretelling an ecological disaster that will annihilate the sensitive Hudson Bay Lowlands.

While recovering, he ruminates on a difficult decision: to ignore the warning or act on his conscience and stop the mines at the cost of his livelihood and the security of his family. Seeking answers, he returns to Nawadjiwon, where local Jiisakii medicine man Francis Bizheu performs a Shaking Tent ceremony. The spirits validate John's vision, but Nawadjiwon faces deep division over the mines, and Westlund Amecor threatens extraordinary and deadly measures to secure the multi-billion-dollar project. As conditions at Nawadjiwon worsen and a monstrous autumn blizzard descends on the region, the council votes to call upon the Bear Men, warriors sworn to protect their people at any cost. The blizzard hits with full force as battle commences. John faces the ultimate moral dilemma. How far will you go to do what is right?