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What turns someone into a serial killer? How do they go undetected for so long and what compels them to keep killing? Meet the criminal investigators and serial killers they profile. This compelling documentary focusses on Richard Cottingham, one of the most notorious killers of the 80s, Elmer Wayne Henley, one of the Houston Mass Murderers and killer nurse Wolfgang Lange. Their candid conversations with the investigators about their actions are disturbing yet insightful.