A book about a school shooter is always going to be difficult. But as usual, Picoult tells the story from different voices and POVs. She raises questions about bullying and its impact. Making the characters human and intersting. 
 I will say that though I did feel sorry for Peter, I still can't like him. Maybe because I believe there is always other choices to one's actions. Maybe because there was a hostage situation at my high school in the early 80s (luckily no one was hurt). 
 This is a good story as usual with her books