Rahvaunia

The BAU investigates a group of suspects with a pack mentality who are randomly selecting their victims in the nation's capital and murdering them for the thrill of it.

When an old pal of Torres' comes to him, dishevelled and bloodied, for guidance amid an undercover FBI operation and then disappears, the team help track him down; McGee prepares to be a contestant on a popular game show.

Seth becomes hell-bent on seeking justice when he discovers that people in his hometown have fallen ill because of groundwater contamination. Plus, Allison, Sandra and Jay help Jill on a challenging case.

Judge Byrne is conflicted over a case that requires a disproportionate mandatory minimum sentence. Meanwhile, Leonard needs to decide whether to charge against a political figure.

Leonard is forced to face some insecurities when his case leads him to consider right and wrong. Meanwhile, Sandra takes on Seth, who files charges against a comic.

Jill and Roger face off over a drug raid that leaves an inmate fighting for their life. Meanwhile, Kate investigates an animal smuggling case involving the death of a panda, and Jay discovers his father fell victim to a pyramid scheme.