May/June 1940. 400,000 British soldiers are holed up in the French port town of Dunkirk. The only way out is via sea, and the Germans have air superiority, bombing the British soldiers and ships without much opposition. The situation looks dire and, in desperation, Britain sends civilian boats to try to evacuate the beleaguered forces. This is that story, seen through the eyes of a soldier among those trapped forces, two RAF fighter pilots and a group of civilians on their boat, part of the evacuation fleet.