Through negotiations with the neighboring monarch, the King of Zollenstein arranges for his son to marry the Princess of Saxonia, but later discovers that the prince already has wed Lady Maulfrey Le Fay in secret. The king angrily exiles his son to England but while on his deathbed, calls him back to Zollenstein where Lady Le Fay dies in childbirth. After the prince succeeds to the throne, Boris, his father's illegitimate brother, bribes Betta, Lady Le Fay's maid, to kill the baby boy as part of a plot to overthrow the prince. Instead of slaying the child, Betta hides him and raises him as her own, calling him John Mortimer. When the new king dies in an accident, Boris claims the crown, but the Grand Chancellor, his enemy, meets John by chance and, struck by his resemblance to the Royal Family, declares him the true heir. Boris attempts to discredit John, but Betta produces proof of his heritage.