Excellent book--differs from the movie in some very important ways, but also helped me make sense of the movie, which I hadn't entirely, previously. 
 The framing story of the present-day descendants of the two magicians was weak, though, and the ending 1960s-horror-movie wink-at-the-camera cheesy. The story of the rival magicians was excellent. The journalist? Eh, those sections are dead wood.