On his eighteenth birthday David is given a six-month-old German Shepherd puppy, and immediately a bond is formed between David and Lady, as he calls her. They become inseparable, working together on the family farm in Yorkshire.
It is, however, 1944, and the country is still engaged in World War Two so it is only a short time before David receives his call up papers to fight for his country. He wants to do his duty but is worried about leaving Lady behind, David then discovers he is able to enlist her as a guard dog to work alongside him.
Although the Germans are in retreat there is still fierce fighting and David, along with Lady, is taken as prisoner of war. Whilst in the camp Lady offers comfort to the internees, and is even a link between the internees and the German guards, and the bond between her and David becomes even stronger.
This bond, indeed love, for each other makes them even more inseparable right to the very end.