On a Thursday of 1999, Kevin, a boy less than 16 years old shot 9 people in his school. His mother Eva recalled in the letters of confession she wrote to her husband her hesitation before her pregnancy, her bad feeling after giving birth to Kevin and the whole process that how her son changed into a murderer. In fact, the son was not welcomed by his mother from the beginning of his life, and the destructive character of Kevin has been frightening and troubling the mother. She tried to find out the mistakes she had made and the cause for the tragedy in her honest introspection. 1999年的一个星期四，将满十六岁的凯文，在校园内射杀了九个人。而他的母亲艾娃则在一连串写给丈夫的忏悔信中，回溯了她怀胎前的犹豫、及怀胎后生下凯文后的不良感受，以及看着儿子变成杀人犯的整个过程。其实，这位职业女性自儿子出生起就不喜欢这个小生命的到来。而凯文在成长过程中所表现出的毁灭性格，更是令她心生畏惧，不知所措。这位母亲试图从诚实的反省中找出自己所应背负的过错和导致这场惨剧的原因。