1942. Determined to do her bit for the war effort, Yorkshire lass Evie Sinclair leaves her island home to become an Ack Ack Gunner Girl, defending Britain from Luftwaffe attacks. Evie embarks on a gruelling training programme with fellow recruits Lily and Gloria - and the three become firm friends. At a local dance, Evie meets handsome young RAF pilot, Matt, and the pair begin a passionate romance. Then tragedy strikes. Forced to leave the services, Evie returns home - only to be shunned by her disapproving mother. Alone and pregnant, Evie is determined to keep her baby. But life will be tough for a penniless unmarried mother at a time when women are judged harshly and the men are away at war. It's a long way from Evie's carefree days as a Gunner Girl. Will she ever be reunited with Lily and Gloria?