武则天登基前，“无头神将”怪物奇袭皇陵，屠杀官兵和工匠。武后派民间神探狄仁杰调查此案。狄仁杰多次涉险后终于发现幕后黑手的身份和无头神将的真面目。敌人袭击祭天大典，狄仁杰摧毁“无头神将”，击溃敌人，保护了武后。
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