"A Mother's Reckoning: Living in the Aftermath of Tragedy" is a memoir by {Sue Klebold}, the mother of {Dylan Klebold}, one of the perpetrators of the {Columbine High School shooting} in 1999. In the book, she reflects on her experiences and emotions following the tragedy, exploring themes of grief, guilt, and the search for understanding. Klebold shares her journey of coming to terms with her son's actions and the impact on the victims' families. She emphasizes the importance of mental health awareness and the need for open conversations about the signs of distress in young people to prevent future tragedies.