During the early days of World War II, with the fall of France imminent, Britain faces its darkest hour as the threat of invasion looms. As the seemingly unstoppable Nazi forces advance, and with the Allied army cornered on the beaches of Dunkirk, the fate of Western Europe hangs on the leadership of the newly-appointed British Prime Minister Winston Churchill (Gary Oldman). While maneuvering his political rivals, he must confront the ultimate choice: negotiate with Hitler and save the British people at a terrible cost or rally the nation and fight on against incredible odds.