In the spring of 1866, as the wounds of the American Civil War still smolder, a new threat rises along the northern border. William Tempest, a young medical student in Toronto, has everything to live for - a promising career, a new wife, and a child on the way. But when Irish-American militants launch a daring invasion of of Canada, he is torn from his studies and thrust into a conflict he never expected to fight. Led by the battle-hardened General John O'Neil, thousands of Fenian veterans cross into Canadian territory, bringing the violence of the Civil War with them. As fear spreads and militias mobilize, William must confront the brutal realities of war, loyalty and sacrifice. Inspired by true events of the Fenian Raids, 1866 is a gripping historical novel about ordinary people caught in extraordinary moments - and the fight to defend a nation still finding its identity.