Jeffrey De Serrano

As the team tracks a copycat bomber, Gideon learns that the perpetrator is responsible for murdering his previous team.

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 (Jackson Hurst) returns for Hetty's resignation.

Callen takes on a secret project without informing the team. After calling off his operation, the team rush to locate him.

Sam fears for his family's safety when his wife is called to resume a former CIA cover, after a case suggests ties to the infamous Sidorov and his stolen nukes.

Walt and the team look into the disappearances of several Cheyenne foster children and an unregistered sex offender.

Horatio goes looking for his son when he goes missing during a prison break. Meanwhile, Ryan causes issues with his former colleagues.