Brooke has read both novels: "The Da Vinci Code" and "Angels & Demons", by Dan Brown. She says "Angels & Demons" is the better of the two. I've read neither of the novels, but have seen both the Ron Howard-directed movies. And we both agree that this so-called prequel is the better film, too.
Tom Hanks seems to have a relatively easy job portraying the stoic Professor Langdon, with the exception of the difficult swimming techniques he performs in the opening scene. I enjoyed the parts where Langdon and his female sidekick peruse through some original copies of Galileo's writings, since I discuss those in the astronomy class I teach.
Also, while The Da Vinci Code angered Christians of many varied traditions for its declaration that Jesus fathered a child with Mary Magdalene, Angels & Demons seems to me like it would only anger Catholic historians.
This is a fun popcorn movie with more action that the first film, and a very unexpected twist at the end--so long as you haven't read the novel.