The Giver Quartet

I bet many of you read The Giver when you were younger.  A friend of mine recommended I reread it and to finish the "series".  I put series in quotations because they can all stand alone, but they have connections within them too.

 

  

I was told to read them in this order: Messenger, Gathering Blue, The Giver, Son.  But like I said, they can all stand alone so really any order works.