Did not live up to promise. Not even close.
On the bright side, I had insomnia, so I read this from 3:00 am to 4:30 am. It is probably not a good thing that after finishing it, I promptly rolled over and went to sleep. Given that this was about a school shooting where 34 students/teachers were murdered, that tells you pretty much all you need to know about the level of emotional engagement I had with this book.