建国之初，古老的中华大地一派喜气，然而欢愉的背后仍有冰冷的暗流涌动。在四川省渝州，曾经称霸一时的土匪头子白敬斋被人民政府正法，而他曾居住过的老宅闹鬼的传闻则越传越凶。龙飞十一名来自北京的青年，他在渝州当地档案馆做文员，而档案馆的宿舍正是征用自白敬斋的老宅。由于所有人都怕鬼，因此龙飞只得一个人住进宿舍，却接连遭遇多起奇怪灵异的事件。不久，档案馆发生一起命案，刑警队长肖克由此入驻档案馆调查。在这一过程中，肖克和龙飞不仅感知到自己身上的异样，更偶然知晓了一个名为“梅花党”的特务组织的秘密……
本片由张宝瑞的长篇小说《梅花党》改编。
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