Set during the height of World War I, Passchendaele tells the story of an important event in Canadian history through the eyes of Sgt. Michael Dunne (Gross), a soldier who is wounded in France and returns to his home in Calgary emotionally and physically scarred.
While recovering, Michael meets Sarah (Dhavernas) and becomes determined to win her heart. When Sarah’s asthmatic younger brother David (Dinicol) enlists to fight in the war, Michael returns to the battlefield in order to protect him. The two men are sent to fight against impossible odds in the battle of Passchendaele.