影片主要讲述了长安城内，曲江池中突发水怪食人事件，大理寺卿薛杨（李岩 饰）与仵作上官羽（徐冬冬 饰）奉命查清命案真相。两人调查过程中发现，在曲江池底有大量散落的骷髅与人骨，其中更隐藏着一个关乎朝堂稳定的惊天阴谋。无名尸体惨死江中，长安城内，鱼妖作怪的谣言四起，数名小乞丐接连离奇失踪，更使案件疑点重重。鱼怪是妖人巫岩沱（尹子维 饰）蓄意豢养？太子（马率 饰）在曲江池上祭母，会惨遭鱼怪与杀手双重围攻？神秘女剑客（彭静 饰）为何冒死追杀巫岩沱？御史中丞郭长之（刘风刚 饰）与兵部尚书沈术（杨永文 饰）孰忠孰奸？惊险案中案环环相扣，谜团揭露迫在眉睫。
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