A father turns to CNU to prevent a hostage situation after finding his teenage son's notebook full of violent images, but Matt and Emily arrive at the school after the hostage situation begins. The situation turns when one of the four gunmen shoots a hostage and takes his three comrades hostage as well.

As Darah, daughter of polygamous cult leader Warren Keegan, attempts to escape from her father and reunite with her sister, she is abducted by Warren and his three wives. Warren Keegan is wanted by the FBI after he assaulted a federal officer. By tracking the satellite dish Warren installed on his recreational vehicle, Matt and Emily are able to locate the hostage and her hostage takers. They find out from Darah's sister, who was Warren's wife before she escaped, that Warren believes that he could be saved from the apocalypse if he had four wives. However, Warren's actual reasons behind his marriages are unknown to Matt and Emily, and Warren's wives.

The key witness in a federal money-laundering case and his wife are kidnapped and held hostage during the trial. Knowing the witness'value to the prosecution, the hostage-taker demands a $2 million ransom from the federal government. Matt and Emily, under Cheryl's leadership, join forces with Cheryl's ex-boyfriend, Sam, who is the FBI agent working on the case, to resolve the crisis.