Liverpool, 1936 Polly's guardian angel has to work overtime when her large family is forced to move to central Liverpool. With a hardworking mother, a sick father and her family close to ruin, Polly is easily led astray by the handsome, Sunny Anderson. But soon war looms, and Sunny joins the navy to train as a signaller. After the horrors of the May blitz, Polly decides she too wants to help her country and goes into the WRNS. She hears that an old flame, Tad Donoghue, is now in the Royal Air Force. Tad hopes to be reunited with his Polly, but she is in love with Sunny . . . isn't she?