The plot is based on the 2009 novel of the same name by Lissa Evans, which follows a British movie crew during World War II, who try to boost morale after the infamous London Blitz devastated the area. Gabby Chiappe, who has written for British TV shows such as The Paradise and Shetland, is writing the adapted screenplay.
Sam Claflin most recently starred in The Quiet Ones and he will next be seen as Finnick Odair in Lionsgate's The Hunger Games: Mockingjay Part 1. He is also starring in Lone Scherfig's The Riot Club, which is rolling out in overseas territories soon. Lily James will next be seen in Cinderella and Pride and Prejudice and Zombies.