剧情介绍
Non-fiction crime author M. William Phelps and criminal profiler John Kelly revisit unsolved homicides believed to be the work of serial killers. Joining them in the hunt for answers is an unlikely and anonymous source: a convict serving multiple life sentences for a series of murders. Known only to audiences as '13,' the source offers his expert opinion about potential motivations behind these chilling cold cases, using his own personal experience to formulate theories.
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