Delphine is the author of an autobiographical novel that has become a bestseller. Exhausted by the promotional tour, just when she feels out of place, paralyzed by the idea of having to start writing again, she meets Elle, a young, attractive, intelligent, intuitive woman who seems to understand her better than anyone.

The story of the miraculous evacuation of Allied soldiers from Belgium, Britain, Canada and France, who were cut off and surrounded by the German army from the beaches and harbour of Dunkirk between May 26th and June 4th 1940 during World War II.