Casino Royale

There aren't too many variations from the most recent movie version of this book (or vice-versa, maybe), but this is worth the read based on the quality of the writing and a slight additional depth that you get with the characters, action, and storyline. It seems like any novels in this series would ultimately be best served for those that have not seen the corresponding films or can't recall the story beats, thus allowing for the potential of fresh and exciting journeys.