Cabin Fever

When an explosion at a summit for global terror results in the death of a Navy Petty Officer, the NCIS team investigates. Gibbs later opts to sit out for the duration of the case to help Fornell, who is on the verge of self-destruction following the death of his wife. Eventually, the NCIS team discovers that Sergei Mishnev is the half-brother of deceased terrorist, Ari Haswari. Sergei's regime of terror eventually comes to an end when he is shot dead, this time at Fornell's hands.