故事发生在三个月之后，Morgan（去伦敦执行奥运会安保任务）和Garcia（帮助Prentiss搬入新家）从英国归来，发现身边多了一个人——长期在联邦调查局工作的语言学专家Alex Blake正式加入BAU调查组。Alex天不怕地不怕，曾因为和Strauss的矛盾而闹得满城风云。Garcia对这个新来的女人并不看好，但Alex高超的技艺最终让她转变了观念。这是好事情——BAU调查组必须明白「团结才是力量」的道理，否则他们无法面对本季的新威胁。在首集结尾...
大BOSS终于出现了。他模仿BAU一直以来所破案件：在Hotch走出女友楼外时偷拍了照片；黑了Garcia的系统；绑走了小组主管Strauss，还羞辱地让她服用了含有迷幻药与冰毒混合的酒，使其迷迷糊糊地死在纽约街头。Kevin后来证明，攻击系统时，他正身在Garcia的家中。所有证据都证明了，“复制者”是FBI的内部人员……
狡猾凶狠的“复制者（The Replicator）”集中所有火力对付BAU调查组，其中一名成员成为他的下一个谋杀目标。与此同时，BAU调查组奉命来到曼哈顿调查一系列因为过度服用禁药导致的死亡事件。死者服用的是摇头丸，看上去极度兴奋。Hotch发现与他关系疏远的兄弟Sean似乎也卷入了这起事件，而且卷入的程度比他想象的要深。
两名小毛贼想盗窃一辆停在路边的车子，随后他们发现藏在后备箱里的两具尸体。BAU发现了另外几起夫妇被杀的案子，他们决定展开调查。随后又有一名女子被弃尸在汽车后背箱中，可她的丈夫却没有被绑架杀害。BAU察觉到凶手改变犯案模式，他们经过一系列的寻访确定了一名嫌疑人，而这名嫌疑人手上还有一名女性人质，BAU必须将人…
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