Hal Devi

The team is called upon by the governor when a virus leaves his daughter with only 24 hours to live.

Believing it to be her duty as Caroline's best friend, Max is intent on organising a party for her, but when she realises that all Caroline really wants is to see her father, she organises a trip to the prison instead.

The BAU investigates an urban vampire in New York who kidnaps his victims at night and holds them underground in the sewer system. Also, Reid makes an impossible decision in prison that severely affects himself and other inmates.

Investigating a deadly dispute, Kensi connects with a discharged Navy intelligence officer who has post-traumatic stress disorder.

Mickey makes an attempt to quit smoking; Ben makes a new friend.

The team return to their old training ground to investigate the death of a recruit officer. Meanwhile, Castle faces a series of consequences after a decision.