I haven't actually read the books on which the film is based; I am a little too old I think. My trilogies were The White Mountain trilogy and, later, Asimov's Foundation trilogy. Well and Lord of the Rings, of course.
I bought the books a few years ago on the recommendation of a friend but this was when I was having trouble reading much of anything and since I hadn't read them the first time around they didn't have that aura of childhood mystery so I never got past the first few chapters of the first book. Maybe I should pick them up again. Because I need another book to be in the middle of. I do!