In the small Irish-Canadian settlement of Lucan, Ontario, tensions between the Donnelly family and their neighbors erupted into one of Canada’s most infamous acts of mob justice. The Donnellys, long accused of feuding, theft, and violence, had become both feared and resented within the community. One winter night, a group of vigilantes descended upon their homestead, brutally killing James, Johannah, and several of their children before burning the house to the ground. Though several men were charged, no one was ever convicted. The massacre became legend, a dark story of vengeance, prejudice, and the thin line between justice and murder on the Canadian frontier.