It is 1918; the Kaiser's empire is about to fall and Captain Harry Phillips, a prisoner of war in a Romanian hospital, has had a very hard time of it. Then, out of the blue, comes an offer he can't refuse, a ticket home to his beloved England and to the arms of his much missed fiancee Elizabeth. But this ticket comes with a heavy price to pay; Harry must marry beautiful, headstrong Princess Irena of Moldova, who's only hope of survival is to leave the country and he must risk both their lives by escorting her back to England. As they set off on their long and treacherous journey with enemies at every turn, Harry begins to realise that Irena is not only dangerous but extremely precious cargo. Will he sacrifice everything for this wartime marriage?