A市某人工湖发生溺水事件，溺水者生前以盗墓为生，了解各种机关暗哨，他死亡时，身边还有一个形状像是司南的物品。
关琥跟张燕铎在逃亡途中，无意中看到了这则新闻，张燕铎发现自己以前好像在犯罪组织基地见过司南，为了找出真相，两人乔装打扮进行调查，发现溺水者属于某个盗窃团伙，而他们住的小旅馆正是盗窃团伙的老巢。
根据盗窃团伙提供的资料，关琥跟张燕铎最终找到了隐藏的基地，并瓦解了犯罪组织，但是在基地爆炸中，张燕铎为了掩护关琥，被激流冲走，下落不明。
案子终于破了，关琥收到了张燕铎提前写给自己的一封信，这才明白他一直接近自己，原来都是为了完成代号是绝对零度的计划。（计划是张燕铎跟关琥上司萧白夜暗中设定的）
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