In the wake of a series of fatal shootings, the BAU team travel to Illinois to investigate what appears to be a copycat serial killer.
Special Agent Dom Vail sends out a distress call. When the team find a car covered in blood that is not his, they question whether he is dead or alive.
When his former partner takes hostages at a recruitment centre, Callen tries to find information about a shipment of spike missiles.
The team try to clear Kensi Blye of murder charges, but their task is made more difficult when a private meeting between Blye and a CIA agent turns deadly.
The team find themselves in danger when they investigate the kidnapping of a man who claims to be Callen's father.