Plot summary
A protesting farmer called Harold Clark parks his tractor, whose trailer he claims is filled with explosives, near the US Treasury building and the Lightman Group offices, demanding to speak to the President. The FBI sets up its command center in the Lightman's office, requiring Lightman to determine if there is actually a bomb in the tractor trailer. He realizes that Clark is not acting alone. As his team races to find the accomplices, Lightman must then work out if Clark is perpetrator or accomplice or victim, while battling the FBI's preference for simply blowing up Clark. Meanwhile, Loker plays babysitter to third-graders stuck in the Lightman Group office.
Credits
Adapted from Wikipedia contributors, List of Lie to Me episodes. HTML formatting and reference markers removed.