As the Second World War rages on, nurse Kitty Pattison's life takes a nomadic turn as her work with the Red Cross sees her traversing the country, moving from post to post. With her best friends Jo and Trixie also scattered across the UK, and her soldier sweetheart Michael off on the continent undertaking medical missions he can't discuss, the war takes its toll and long days are followed by sleepless nights interrupted only by nightmares of what she's seen on the wards. Now, Kitty's hopes rise and fall with the arrival of the post -- the only thing that keeps her connected to her aunt and uncle, her dear friends, and her Michael -- and every moment spent with those she loves is held dear, because each one could be the last...