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When Paige's estranged mother stumbles upon a forgotten nuclear reactor precariously close to exploding, she calls on the team for help.

Walter takes a perilous swim to rescue a woman trapped in the La Brea tar pits; Paige's mother maximizes Ralph's troop cookie sales.

Team Scorpion encounters gunrunners while spending Christmas Eve at an electronics-free mountain getaway; Tim makes a decision about his place on the team.

The team turns to Holly Snow for help when a Navy officer's death is connected to a prostitute.

Gibbs, Fornell and the team try to determine the truth when a polygraph specialist's night job leads to murder.

DiNozzo gets overly involved in the search for a murder victim's missing sister.

Rossi's daughter, a journalist, investigates the disappearance of a college student; JJ comes back from maternity leave.

As the BAU welcomes back Emily Prentiss, they're called upon to investigate the disappearance of three women.