In Alexander Dumas’s 1847 novel The Man in the Iron Mask, the three musketeers are once again united to defend honor and the crown. This time, they work together to replace the King of France with his twin brother–the titular Man in the Iron Mask. Yet, while much of this story is literary nonfiction, the kernels of truth are compelling. In fact, there was a real Man in the Iron Mask. With that said, historical mysteries are interesting because when they remain unsolved for centuries, speculation tends to overshadow factual accounts. This is definitely true in the case of the man in the iron mask, who was an unknown figure in history, likely imprisoned for political crimes against King Louis XIV.