After Ducky is attacked by a man claiming to have information about his half-brother, who died decades ago, Gibbs's team searches for the perpetrator, as Ducky recalls the final emotional days he had with his sibling.
Jonas and the team must travel through enemy territory to bring a bride to her groom, preserving a truce between two warring Afghan tribes; Kim and Bob try to expose a man linked to terrorists.
The confrontation between the survivors and the freighter people begins.
Kate learns that someone knows the secret of Aaron's parentage; the dramatic shifts through time endanger the remaining island survivors.
Kate takes drastic measures to save Ben's life when Jack refuses to help.
