January 1941. Peggy Collins has learned a lot during her time as a Spark Girl. Posted to Swansea, as a driver to the squadron leader, she often hears things she shouldn't and she knows to be discreet, understanding how serious the phrase, loose lips sink ships really is. Peggy meets and falls in love with pilot Jim Hudson, but her heart is broken when he becomes missing in action and Peggy is left fearing the worst. That isn't the end of the shocks in store for Peggy and she is forced to remember a promise made long ago. But can she keep her word while the bombs fall?