The body of a Marine lieutenant is found hidden under an 18-wheeler, and the NCIS team tracks the vehicle's previous locations to pinpoint the crime scene and suspect. Also, Sloane encourages the team to talk about Ziva's recent reappearance.
DiNozzo, Bishop and her husband, who are stuck at Dulles airport due to inclement weather, work an NCIS case involving an elevated terrorist threat to Northeast airports during the Thanksgiving travel period.
The NCIS team consult with three cyber-terrorists they imprisoned after a citywide Internet shutdown the week before Christmas. Meanwhile, McGee reflects on the case and Gibbs' infamous rules as he writes a heartfelt letter to his father.