SPOILER ALERT!
The Giver

This is a story of an absolute -- an extreme, but it might make one think about what (and how much) we, society at large, accept as social norms and mores are no more than conditioning that has been handed down through the generations. While I don't fully understand the banning of this book in certain quarters, I can see how it might be disconcerting to some, who thereafter seek to limit its audience.
There are 3 other books to round out this quartet: 'Gathering Blue', 'Messenger', and 'Son'.