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征以真實的檔案片段為特色