Tripp Pickell

While investigating a serial bomber's attack on a small town, Gideon learns that the perpetrator is a protege of his nemesis, who had murdered his previous team of profilers.

Now that Emily Prentiss has returned, the unit track down a serial killer hiding out in the woods before he can strike again.

When a dog owner is found mauled by his own animal, the NCIS team are called to ensure there was no other foul play. However, Abby believes that the dog is innocent, and is prepared to risk her job to prove it. Meanwhile, Gibbs learns about Jenny's secret.

As the imminent threat of catastrophe crystallises, President Taylor tasks Jack with a crucial mission. Adviser Ethan Kanin also makes a return.