The team are called to shut down a campus in order to create a profile for a killer, but they have doubts about the main suspect after taking them into custody.
After a series of suspicious murders occur, Prentiss suspects her old Interpol nemesis, making her fear for the safety of her BAU team as he closes in on her.
After a rise in deaths caused by black market opioid use, the team links the street drug to funding for terrorist activities.
The team joins forces with the FBI when a Marine is murdered by nerve gas, and Deeks shares his dream of quitting law enforcement to open a bar.
Callen continues hunting Katya; Kilbride enlists NCIS to help find a truckload of stolen guns, but the assignment becomes more challenging when their suspect is found dead.