I highly recommend reading the short story “Eisenheim the Illusionist” by Steven Millhauser, that was printed in the Spring 2006 Zoetrope; wonderfully written and terribly engaging.
Having read this short story I was excited to see the movie. The short story reads like an outline for a screenplay and has all the juicy visual elements spelled out so I suppose my expectations were high. I was very disappointed with the screenwriter’s boring injection of the trite love interest and the evil prince (though that part was acted very well).
The original story was exciting and enticing without the need for the typically Hollywood thwarted love aspect and quite honestly it ruined the story. The dialogue in those scenes was predictable, and for me every diversion from the original concept was obvious as all the new elements fell flat. As an audience our collective attention was only held by the well placed and timed illusions and expansion on the mysterious character of Eisenheim (in other words all of Millhauser’s handiwork, none of the screenwriter’s).
Clearly I suggest that you read the short story, but only after you see the movie (if you choose to see the movie at all). You might possibly enjoy the movie if you aren’t painfully aware of how badly they screwed up the story.