For every psychopath there are signs. Would you see them? Revisiting some of the most dangerous killers in modern history to see which psychopathic traits they exhibited. Featuring real archive footage. 　　每一個(gè)精神病患者都有跡象。你會(huì)看到他們嗎？重溫一些現(xiàn)代史上最危險(xiǎn)的殺手，看看他們表現(xiàn)出哪些精神變態(tài)的特征。以真實(shí)的檔案片段為特色。