1910, Oklahoma. Thomas Winczlav, Milan's son, sees his life turned upside down when he learns he is the heir to the O'Casey distilleries – a colossal fortune he'll have to share with his twin sister Lisa, who lives in France. As the First World War begins, a sometimes naïve, often flighty Tom will do his best to run his new business; meanwhile, the aviation-obsessed Lisa will carve herself a place in the skies of Europe, dominated by a certain Red Baron …