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Callen goes undercover to infiltrate a network of Chechen terrorists who are recruiting foreign fighters to join their cause and planning their next attack in the U.S..
Distraught widow is suspicious of the circumstances surrounding her Marine husband's last battle and Sam and Callen help to determine if there has been a cover-up. Meanwhile, Hetty summons Operational Psychologist Nate Getz to be her "pawn" and the rest of the NCIS: LA sense another evaluation on the horizon.
Callen, Sam, Kensi and Deeks go undercover as an elite tactical force in order to investigate an ambush tied to a cartel kingpin with terrorist connections.
Season 4 of NCIS: Los Angeles begins where the third season ended with Callen facing the fallout of shooting The Chameleon. He forcefully continues investigating alone and is kidnapped after by hit men. The team tackles many exciting and difficult cases including investigating the death of a former Marine killed in a drone strike in the Middle East.