You should read this book. Well, first you should read the first book in the series... first things first after all.
So first you should read Discovery of Witches. But then you must read the Shadow of Night. Because these books are fantastic, Shadow of Night came out on Tuesday-- now I'm rereading it for the second time to really glean how awesome it was, because it does seem possible that I missed something the first time around I was reading it so quickly..
But its just that good.