纽约，一名女童在登上一辆汽车后遇害身亡，女警梅根（艾丽莎·杜什库 Eliza Dushku 饰）调查此案，她敏锐的意识到被害女童的姓与名以及案发地三者的首字母相同，但除此之外毫无线索，梅根为查案用尽办法，然而却一无所获，反而梅根本人的精神压力日渐累积，她开始看到被害女童的幻影，终于精力不支甚至选择自杀，最后不得不接受精神治疗
两年后，再次有符合首字母规律的女童被害案件发生，此时的梅根不顾上司反对，再次介入调查，她和搭档在排查多位嫌疑人的同时，这位针对女童的“首字母杀手”作案愈发频繁 梅根究竟能否拼贴出凶手的真相
本片根据真实案件改编
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