On April 20, 1999, Eric Harris and Dylan Klebold walked into Columbine High School in Littleton, Colorado. In a matter of minutes, they would kill twelve students and a teacher and wound twenty-four others before taking their own lives. For the last sixteen years, Sue Klebold, Dylan's mother, has lived with the indescribable grief and shame of that day. How could her child, the promising young man she had loved and raised, be responsible for such...