The team is called to southwest California when two murders occur within three hours of each other in San Diego and Los Angeles. Each victim was chained to the back of a vehicle and dragged. The first was dragged post mortem, while the second was still alive when initially dragged, which shows either two unsubs or a quick escalation in the evolution of the single unsub's psyche. The victimology is different, the first a middle class wife and mother, the second an ex-con drug addict. These differences are brought together when a third murder occurs. Garcia determines that a common factor is a connection to the violent death of two specific children, and people associated with those children being brought together through an online support group. They quickly identify the two unsubs and their intended fourth target. However, the nature of that fourth intended victim has an impact on how this final encounter will play out.