Season four of NCIS: Los Angeles begins with Callen facing the fallout of shooting The Chameleon. He is forced to continue investigating alone and is kidnapped after by Iranian hit men. The team tackles many exciting and difficult cases including having Nell go undercover in an experimental strategy game developed by the Office of Naval Intelligence when four participants are killed in a restaurant bombing. In a two part episode, Sam receives a prerecorded phone call from a former coworker and ex-CIA agent asking for his help after he is murdered.
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