Kate, Sally, Maxine and Elsie work at the naval armament depot on the shores of Portsmouth harbour. The hours are long and the work difficult and dangerous, but even in the dark days of the Second World War they still find time to enjoy themselves, at the ENSA concerts and hops in the local drill hall. However, beneath the careless laughter each girl nurses a secret. Kate is terrified that she carries a jinx, while Maxine has discovered a family secret which turns her bitterly against both her parents. Elsie is still grieving the loss of her son Graham, killed in the Blitz. And spirited young Sally has lied about her age in order to get her job. Each faces a dilemma that will be resolved only after D-Day in June 1944. What happens then brings each woman face to face with her own strengths and failings and, ultimately, her own destiny.