I'm up to chapter 5, and Anthony Horowitz is doing a good job on keeping the suspense and all. Alex isn't working for MI6 now, but is out by himself with no help. (I bet MI6 will come in later)
So, I can't say much about the book yet, but the Alex Rider series is one of my favorites.
It all started out with Stormbreaker, and a short summary can be read in a previous blog about the movie.