In the aftermath of Catherine's suicide, Detective John Cardinal outwardly accepts the evidence that she took her own life, but when he starts to receive taunting greeting cards blaming him for her death, he begins to question the suicide.。一群普通人被招募来做一个人类行为学的实验,研究者给他们每个人都分配了一个角色,一组人扮演囚犯,另一组人扮演狱卒。实验的目的是想看看这样分配角色、权力会对参与者产生怎样的影响。。