Guest star Marisol Nichols plays Callen’s ex-partner, Tracy Keller, who takes a Navy recruitment center hostage in a desperate attempt to get in touch with him. They were in the CIA together and their cover was husband and wife, though they were more than just partners. Now she’s in trouble after going undercover to get missiles back from a white supremacist group and revealing some dirty FBI agents looking to make a little money on the deal themselves. After Tracy kills the agent in charge of selling the code cards to the arms dealer, she and Callen resurrect their old aliases and go in instead so that they can keep the missiles off the street. When all is said and done, Callen and Tracy work out their issues and he lets her go. But it turns out she was behind the whole thing and just when she thinks she’s gotten away with the money, Callen and Sam show up – having been on to her all along.
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