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"Fans of the book? I think, I mean the story has stayed almost entirely true to the book apart from obviously they had to age the characters up for obvious reasons. I think it all depends on what they got out of the book. If they loved the Battle Room scenes then obviously that's going to appeal to them. But if they read the book for the stories and the... not the stories, the morals behind it and the themes, then... that's all still intact in the screenplay I think. It's a really deep story."
Source: Showbiz Junkies