When Sam's daughter is kidnapped after leading citywide protests, he will stop at nothing to find her; Deeks rejoins NCIS; Callen searches for answers about Anna.
As Nell keeps Callen in the dark about the team's search for Katya, Callen manages to track down the person tailing him to a remote location that is teeming with Russians.
Tennis legend John McEnroe comes under suspicion when witnesses claim that he was the last person to see a murder victim alive. Meanwhile, the CSIs support Mac when he must endure a disciplinary hearing after the death of Clay Dobson.
When a paintball player is found shot dead, Flack realises that a dirty cop under his supervision could be to blame. Meanwhile, Mac comes face to face with his deceased wife's son, a young man he never got the chance to know.
The hunt for Nate Haskell takes the team to Los Angeles, and the case grows even more personal for Langston when his ex-wife is kidnapped.