In 1940, Britain was at war, with enemy air raids and bombings every day. However, what was more broken than the devastated London was the desperate hearts of the people. Facing the unknown impermanence of life, movies became the only spiritual comfort. The Film Department of the Information Bureau wanted to boost national morale and public opinion, and began to shoot political propaganda films. In order to increase the female perspective in the film, Catherine (Gemma Arterton), who was originally engaged in advertising copywriting, was invited to join the screenwriter team and write a script with editor-in-chief Buckley (Sam Claflin) to praise the heroic deeds of the British in the Dunkirk operation. The masculine Buckley met the gentle Catherine, and they mocked each other's dialogues and bickered constantly, but as the two experienced crazy rushing and scripts together, tacit understanding and love quietly grew. However, the war continued to deteriorate, and the filming of the film also faced difficulties. Catherine had to face the fact that she was married...