It's 1939 and when war breaks out, Carrie Anderson hopes to join the Forces alongside her twin brother Johnnie. But family duty means she must stay at home - and so she takes over a bookstall at her local railway station. She may not be on the front line but, in recommending books to individuals on the platform, she meets people from all walks of life and feels buoyed that the books she is selling are providing education and escapism for travellers, troops, refugees and evacuees. But when she gifts a book to a soldier, this act of kindness will have repercussions she could never have anticipated. It's the start of a great love story for Carrie - but with war raging, how will it end?