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The remains of a young documentary filmmaker are found in a ventilation shaft in an underground Washington, DC, tunnel. The investigation leads the team to a society living in the tunnels and a lost treasure of American art.
Booth and Brannan investigate the death of a man in what appears to be a mob hit. They are assisted in their investigation by fellow FBI agent, Jamie Kenton. The investigation takes a dangerous turn when Brennan lands in the crosshairs of the killer.
Angela contacts Brennan when her long-time boyfriend, Kirk, goes missing in the desert while they are on vacation together.