There are 7 books in this series
  • Among the Hidden
  • Among the Imposters
  • Among the Betrayed
  • Among the Brave
  • Among the Enemy
  • Among the Free
  • Among the Barons
These are one of the best series ever and if you like intense, action, suspense I am positive you will want to keep reading.
These are all in order and you are better off if you read them in order.
If you want to see Mageret Peterson Haddix's website-Click here
Also, as you can see on her website that she wrote more than this series. I don't know how good they are since I have never read them. But, if you do, please tell me so I can check it out myself.