First of all, I started reading the game of thrones books late, in Septermber 2012 and really, these books took over how much time I have left in my life. They are really hooking and intriguing to read.
Storm of Swords part 1, continues the stories of the mayor characters from the previous books, like Robb or Catelyn. There is one more character joined in to this book but i wont spoil. This book is more of recover and start a new war book. After the battles in the second book, people in Westeros recover and make new realtionships (and once agains George R.R. Martin give you twist you may not like at all). The Troubled King in the North and Jon Snow beyond the Wall are both really interesting and fun to read.
Im kind of sad to say that in this book there is not much fighting, it is really same as the first book which is not bad at all.
Anyway just to say something, if you watch the Game of Thrones Series 2, then you may spoil the first 100-150 pages of this book really.
Im a great fan of this series, keep up the great work George!!