Favorite book to movie

[ilikemytoys]

I'm sure one time or another you've read a book and upon finishing it you think to yourself what a great movie that would make. Since a search didn't show this had been done yet, here's your chance to voice your opinion!
Tell us the book and even a brief description if you want and list who you'd like to see play a character or two. This should be fun.

Book - Split Infinity by Piers Anthony
Stile is caught up between two worlds existing side by side: Proton (Science based) and Phaze (Magic based). Stile primarily lives in Proton and learns that his "double" in Phaze has been murdered. To solve his own demise, Stiles must travel between the two worlds, each filled with wonderfully crafted plot twists. I love the blending of SF and fantasy clichés and situations, making for a very nice and captivating story.

Stile - Garrett Hedlund / Jared Leto
Sheen - Amanda Seyfried