For two couples honeymooning in Sorrento, the future is uncertain, but they are full of the promise of youth. The year is 1938 and the Munich crisis is just over - a relief for both Biff and Rosemary Banks and their new-found friends Konrad and Anna von Riegner. Biff is a pilot in the RAF and Konrad an Oberleutnant-zur-See in the German Kriegsmarine. Together they tour the Amalfi coast.
As the time comes to part, they swear undying friendship, and resolve to meet again in a year's time. But eleven months later, their countries are torn apart by a terrible war - a war that will last for six long years. At the end of it, will their friendship have survived?