影片聚焦臭名昭著的波士顿扼杀者谋杀案：1962年到1964年，13名单身女性在公寓被袭击、性侵、勒死，警方经调查锁定嫌犯Albert DeS alvo，后者认罪被判终身监禁，之后在监狱被人杀死。此案存在诸多疑点，真正的连环杀手和杀害DeSalvo之人至今仍是谜。
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