Jeffrey De Serrano

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.

Callen takes on a secret project, leaving the team in the dark; when Hetty shuts down Callen's operation, the team must locate him before he gets in trouble.

The mole has once again compromised the NCIS team as planted evidence results in the arrests of Callen, Sam, Granger and Deeks, on the day Under Secretary Duggan returns for Hetty's resignation.