大象，本名吴行，报社记者，嗅觉超人，每天需要八个半小时睡眠，害怕闪光灯。
一天，他在工作过程中遇见一件诡异凶杀案，死者死于绳缚窒息，死前身穿红色肚兜，用黑布蒙眼，脚底垂挂一枚秤砣。此案一处，全国各地接二连三出现多起类似案件，有人猜测是同一凶手所为，并通过杀人达到某种用意......这一切激发出大象自身的侦探潜质，开启了追凶征程。随着深入连环命案现场，求助网友、死刑犯、警探，形成独特的"样本分析"破案手法。
凶手一个接一个地被抓获，大象却越发困惑，真相远远不是他想的那样，还藏着一个惊天的秘密。
大象落入陷阱，却浑然不觉......
这一场与人性之恶的博弈，大象已经准备好了，哪怕为此失去生命。
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