Biopic of aircraft designer R.J. Mitchell whose Spitfire became one of the mainstays of the RAF in World War II. Mitchell worked for Supermarine who specialized for many years on developing seaplanes. He enjoyed a good deal of success winning prestigious air races with the help of his test pilot Geoffrey Crisp. Money was always in short supply however and the government was always hesitant to invest. When Supermarine is bought out by Vickers, Mitchell has a bit more leeway. After a visit to Germany in the 1930s, he sees the Nazi threat first-hand and decides to design a fighter with a completely new engine. The result was the famed Spitfire.