It is 1917 and the Great war is a jagged scar across the face of Europe. Soldiers cower in mud-filled trenches, hurling bullets across the war-torn landscape. Above them flies 17-year-old New Zealander Bob Sunday, of the Royal Flying Corps. Before long, Bob finds himself flying against the great German air aces, including the infamous Red Baron, as their warplanes whirl above the battlefields of Arras, Passchendaele and Cambrai.