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. 　　每一個精神病患者都有跡象。你會看到他們嗎？重溫一些現代史上最危險的殺手，看看他們表現出哪些精神變態的特徵。以真實的檔案片段爲特色。