An unhappy farmer threatens the U.S. Treasury Department building by parking his tractor full of explosives nearby. He is claiming to speak to the president for losing his three generation’s farm. Lightman has to figure out whether the threat is real or not. Meanwhile, Loker has to bear down with a group of third graders in a field trip stuck in the Lightman Group offices, due to the possible bomb threat nearby.

A finalist of World Series of Poker is gone missing, so Lightman, Foster and Reynolds go to Vegas to investigate his disappearence. Meanwhile, Loker and Torres start getting close, while going over some footage of Loker’s latest date.

It’s the Holidays and Lightman is asked to go to Afghanistan on a mission to retrieve two captured Marines, with the help of an American expatriate who might have flipped sides.

A troubled teenager turns to the Lightman Group to help him dig up secrets of his past. Meanwhile, on the day after Thanksgiving Loker gets to investigate a deadly stampede at an electronics store.

When a government witness is murdered, the FBI hires The Lightman Group to determine who leaked the witness’ whereabouts to the killers and to protect Agent Reynolds, the star witness in the case. When Reynolds refuses to testify in the case, Lightman and Foster learn he is hiding something in his past

A blast from the past pulls Lightman into a dangerous game of cat and mouse testing his loyalty. The Lightman Group look into a death threat from a high school student.

The Lightman Group brings in Eric Matheson, a man accused of killing his wife, for questioning. To prove his innocence, Eric takes extreme measures, all while putting everyone in danger.

While Cal is on vacation in Mexico, he’s brought in to help investigate the bizarre case of a missing woman. Meanwhile, the rest of the team deals with reports of contaminated blood.

Zoe has the Lightman Group look into a college athlete accused of rape. Meanwhile, Foster and Loker head to a religious compound in order to determine whether or not it is actually a cult.

A woman with multiple personalities comes to Lightman for help. The Lightman Group has to figure out is she either the killer or the witness to a murder. Meanwhile the Lightman Group is also hired to question a candidate to the Supreme Court.