連環殺人犯的行為模式也許個個不同，不過有些人犯下滔天大罪時，就是無法自拔地想留下他的個人標記。從凶手慣用的屍體解剖方式到犯案現場的紀念品，這些違反常理的印記經常用來嘲弄執法人員，但最後往往成為提供檢調單位關鍵線索的證物，可以一舉拿下殺人凶手。本片每一集都深入探索一宗留有凶手標記的連環殺人案，並涵括來自辦案警探人員的第一手報告、犯罪心理學家的訪談，以及被害人的至親好友現身說法。
The behaviors and patterns may differ, but some serial killers simply cannot resist leaving a personal mark on each of their heinous crimes. From postmortem rituals to crime scene mementos, these perverse trademarks are often meant to taunt law enforcement but can end up providing vital clues that help the investigators bring down the perpetrator. Each episode delves into a different case involving a serial killer signature, featuring firsthand accounts from the detectives involved as well as interviews with criminal psychology experts and those close to the victims.
