This is the second book in George R.R. Martin's fantasy series called a Song of Ice and Fire, the sequel to A Game of Thrones. I think that anything I say about this book would be best summarized as:
If you liked Game of Thrones, you will like Clash of Kings. If you couldn't get excited about Game of Thrones, you will find Clash of Kings to be more of the same!
Song of Ice and Fire does not have stories that fit discreetly into book sized portions. It is one massive story with interwoven plotlines that began in Game of Thrones and might eventually end if Martin ever finishes writing the series. So it's hard to review the books individually.
I get more out of these books each time I read them, and pick up on subtle things I never had before. There is so much detail! A minor character in a minor scene will be referred to or refer to something that is significant elsewhere, what a character says seems different given the context later books provide... It's really neat how everything all fits together.
I don't want to name characters still alive in book two because given Martin's tendency to kill off important characters this would be a huge spoiler. But I was struck by how some perspectives were a lot more fast paced and exciting than others in the book. In particular, a new character, Davos, is introduced to relay events going on around one of the land's aspiring kings. The events Davos's chapters describe are the most critical, plot-forwarding of the book but they aren't necessarily as fun to read as those of characters with less plot driving chapters. Funny how that works. In fact I think there is a negative correlation between important events and fun to read chapters. But I don't really mind!
I think the best part about Clash of Kings is the depth that characters get. Certain characters were present in Game of Thrones, but not that interesting. Several of these are really fleshed out in Clash of Kings.
In summary, if you like fantasy and don't mind epic fantasy series with lots of points of view and long waits between books READ MARTIN!