This is a return to form for Brown. It has the same mechanical plot development as usual but the premise is interesting, being based on the work of Dante. With settings in Venice and Florence, references to "Moonraker" (where Bond throws the bad guy through a Venetian clock) and a famous painting of Dante thrown in, and many many more, this is crammed full of thoroughly-researched aspects of Italy, Italian culture, evil plots to destroy the world and modern science.Thorough research is one thing, but Brown is one of those writers who has to show you all the research he did, and that, in addition to the way he frequently stumbles down winding side alleys of unnecessary thought-associations, make the book a little wearying, now and again.That said, the strange similes, the show-off piling on of irrelevant detail have always been part of Brown's repertoire, without greatly harming the volume of his sales. So you can't exactly blame Brown for giving his readers what they want, can you?Robert Langdon's new female assistant bears some remarkable similarities to the Girl with the Dragon Tattoo, a leather-wearing, sassy, spiky haired chick with attitude and an itchy trigger finger. But that's either coincidence or a sign that such heroines are a dime a dozen these days.Even if it is a hokey kind of plot, Brown's new book has some interesting, forward-looking elements, and so you keep turning the pages. It may not be especially intelligent or eye-opening, but it does entertain you when you're in that lazy, hazy mood for unchallenging, easy reading.So I would recommend this to all Brown fans - this is a return to form and the standards he set in his finest works. 

Question: Which is the good premise principal?
Answer: premise is interesting