In 1824 Prince Wilhelm of Prussia and Princess Elisa Radziwill were very much in love, but they had been forbidden to marry. Their story is known as one of the most tragic royal romances of the nineteenth century. But were they in fact lovers, and did they have a child? 

A young woman named Agnes immigrated to Australia in 1848 to become the matriarch of a family in which it was whispered that she was a princess. Such stories abound as old-wives tales and most of them are unfounded, but this particular story is true.

How did this happen, and how did it remain a secret...