So you know all the stuff that was going on offscreen during Dunkirk? That’s centerstage in Darkest Hour, a historical drama that observes British higher-ups during a decisive moment in 1940. Most especially, it focuses on Winston Churchill, who had been Prime Minister less than a month when the evacuation of Dunkirk was executed. But that unlikely event—300,000 trapped British troops ferried across the English Channel from France—is merely one piece of Darkest Hour.