I picked up this book because it was part of the Big Library Read Program through Overdrive and I found I couldn't put it down once it started. The story of a school shooting was heart-wrenching at times, and sweet at others. Told in real time, it flowed between the four points of students who are close to the shooter caught in event, with the entire 54 minute event broken into 2-5 minute intervals. I was glad I picked it up.