A nobleman bribes a maidservant to gain access to the palace and poison the crown prince. Another noble, loyal to the royal family, learns the of the plot and must learn the identity of the would-be assassin before he can succeed in throwing the country into chaos.
The Man in the Iron Mask finds France's King Louis the XIVth who has, unbeknownst to both himself and the kingdom, a twin brother Philip, hidden away. But when Philip realizes his royal heritage, trouble begins in the kingdom that pits the brothers against each other and throws all the kings...