Based on actual events of American serial killer Edmund Kemper, who murdered his grandparents at age 15 and, after being paroled for that crime, killed eight women in 1972 and 1973 including his own mother.
一封没署名的遗书、一群看似无恙的学生,让中学老师郑Sir想起充满暴力与遗憾的童年往事。他亦面对妻子离别、父亲病危,同时必须找出企图轻生的同学,阻止悲剧重现。