The pacing is excellent , and the mystery
Is the plot fresh?
One of the things that continue to amaze me about the quality of the books by Roth is her age and the fact that these are her first two books.  It took a bit to remember what was going on when I picked up Insurgent, since I'd read the first book several months ago.  That said, once things got going I finished the book in a few hours.The pacing is excellent, and the mystery in the book keeps feeding you enough clues to keep you interested.  Additionally, I loved the struggle that the main character faced in choosing between what she believed what right, even though it would hurt those she loved most.Can't wait for the next book. 