Catching Fire: prequel

So I am giong to start the second book of the Hunger Games written by Suzanne Collins if I did not mention before. I have mostly heard good things about the first and second books. Which if you realized, I really liked the first one and so hopefuly I like the second as well. My brother told me that the second on is alright and the third one was just not that interesting. So I do not know if I am going to read that one. I am not really sure what it is about yet (catching fire). I am guessing that it is about how Katniss and Peeta fall in love with each other or Katniss ends up marrying Gale instead. Some future of Katniss. The mystery of Katniss' future is about to be revealed in the next post.