With the Great War raging, can they keep Britain going?

1915. On Beth Healey's eighteenth birthday, she hopes that she will be able to forget the ghastly war and celebrate. But that evening, her twin brother Ned announces that he has signed up to fight.

No longer able to stand working in her parents' village shop while others are doing their bit, Beth applies to join the Army Post Office's new Home Depot on the Regent's Park, and is astounded to be accepted. She will be responsible for making sure that letters and parcels get through to the troops on the front line.

Beth is thrilled to be a crucial part of the war effort and soon makes friends with fellow post girls Milly and Nora, and meets the handsome James. But just as she begins to feel that her life has finally begun, everything starts falling apart, with devastating consequences for Beth and perhaps even the outcome of the war itself. Can Beth and her new friends keep it all together and find happiness at last?