Snakehead was an amazing book that hooked me from the very beginning. There were a lot of mysteries that were solved about Alex's family that he never knew. When I first read the book I was thinking how much better the series could get. As soon as finished the book I thought not much better. The reason for it was, towards the end of the book we get a glimpse of who this "hidden" member of Scorpia is.
If you've read the fifth book of the series entitled "Scorpia" you begin to see that there is an Australian man that is involved in Scorpia. Not much is really said about this man, except he's Austrailian.
Snakehead has a lot of action in it, which was described exceptionally well. Including the two chapter "sparing" match between Major Winston Yu's prize fighter.
There were some times while reading the book that I thought Alex wasn't going to make it out alive this time...but then I realized he's Alex Rider from what I've read nothing can kill him.