里根警察一家对特征剖析这一方法的优缺有所争论。据消息，有人协炸弹意图炸毁城市，丹尼、弗兰克与纽约警察全力搜寻这枚炸弹。

一名身份不明的年轻女子在舞会中被意外谋杀，丹尼与杰基试图通过查询酒店监控以发现线索。当丹尼接到电话要去调查时，女孩尼基也在场，她第一次亲眼看到了谋杀案受害者。

Jackie goes undercover as an escort when she and Danny track down a serial killer who is murdering prostitutes in hotel rooms. Meanwhile, Erin meets a potential suitor at an art gallery who shares her interests.

Danny and Jackie investigate the murder of a Reagan family friend who was an undercover detective. Danny's family starts to worry as the persistent search takes an emotional toll on him.