Lightman investigates one of his mentor's graduate students, whom he is convinced is a psychopath, while Loker and Torres look into a UFO sighting.

A young woman approaches Lightman at his book signing, believing she has seen a murder. Lightman finds that the woman has multiple personalities, and he believes that one of her personalities witnessed the murder. Lightman passes off helping Agent Reynolds vet a potential Supreme Court nominee, instead choosing to pursue the case of the multiple-personality woman. The case is passed on to Torres, whom the nominee does not treat with respect due to her age. Torres puts her preconceived judgments about the man aside when she analyzes the facts. Lightman unlocks the woman's original personality, who helps Lightman find the original murderer. Zoe informs Lightman that she is taking their daughter, Emily, and moving to Chicago to open a law firm. Lightman buys out her stake in The Lightman Group so that she can start her own practice in town.

Lightman is an expert witness at the trial of a woman charged with murdering her high-powered, and much older, husband.

When Cal's old pal, Terry Marsh, comes to town, he brings plenty of trouble with him. Meanwhile, the rest of the team meets with some students from a prep school to determine if any of them are responsible for a threatening tape that was sent to the headmaster.

After a grisly shooting in a federal housing project, Lightman is hired to read the face of the paralyzed victim.

Zoe enlists Lightman to help with her client -- a 22 year-old black star college football player who has been accused of statutory rape with a white 16 year-old girl. The case hits home for Lightman, who learns that his daughter Emily was friends with the group of girls who attend these college fraternity parties. Through the course of their investigation, Lightman and Torres determine that Zoe's client was set-up by the girl, whose friends leaked the video of the hookup. Lightman figures that the man did not know the girl was underage, noting that his face showed that he knew he shouldn't find underage girls attractive. Meanwhile, Foster and Loker travel to a religious compound to determine whether its claim of IRS exemption is valid. They believe the head of the compound is holding the women against their will. Foster facilitates the escape of one woman and her children, and faces the wrath of both Loker and the government. At the end, the girl's father believes the system is protecting the football player, and decides that someone has to pay. He shoots the prosecutor that dropped the charges against the football player, with whose death the episode ends.

Eric Matheson (Garret Dillahunt) is determined to prove that he didn't murder his wife. Torres is assigned to investigate the murder, and goes to the house of the victim's sister. Matheson finds Torre's car and gets into it after she forgot to lock the door. When Torres returns, Matheson holds her at gunpoint, instructing her to drive to the Lightman Group offices. Cal makes a deal with Mattheson, asking him to let all the employees go as long as he helps prove Mattheson's innocence. Mattheson complies, and Foster, Loker, Reynolds and Torres attempt to solve the case, while Loker has second thoughts about not calling the authorities. Cal and the team find out that Mattheson was actually innocent, and that his wife was actually killed by a creditor. Mattheson demands that he sees the creditor, saying he will either take his life or Cal's. Cal pleads for Mattheson to kill him, but Foster, Loker and Reynolds trick Mattheson into letting his guard down after a disguised Loker pretends to recount the last moments of Mattheson's wife's life. As Mattheson is in a moment of rage before killing Loker, Reynolds draws his gun and shoots Mattheson, disarming him. The episode ends with Lightman at Foster's home, asking if he could sleep in her spare room for the night.

A protesting farmer parks his explosives-packed tractor near the US Treasury building. Meanwhile, Loker plays babysitter to third-graders stuck in the Lightman Group office, actress Felicia Day guest stars as their teacher. Miguel Ferrer guest stars as FBI ASAC Steele, Ben Reynolds' boss.

Lightman and his ex-wife, Zoe witness the execution of a murderer they prosecuted 17 years ago and face the possibility that they sent the wrong man to his death.

A missing woman leads the Lightman group to discover criminal activity in the adult film industry.

While on vacation in Mexico with Emily, Lightman becomes involved in the case of a missing American woman, who is a single mother on vacation with her daughter. Upon investigation, Lightman learns that the mother got herself involved with an illegal fertility broker and he manages to find her just in time. Back home, Foster investigates D.C.-area hospitals with Lightman's rival, Jack Rader. They try to uncover the reason that five people have grown gravely ill after receiving blood transfusions.

An Irish terrorist comes to Dr. Lightman to find out who killed his wife and daughter seven years ago, which reveals secrets about Lightman's relationship with Dr. Foster and his past job working counter-terrorism for the government.

Cal spends the holidays in Afghanistan, where he relies solely on an American expatriate to help a mission to find a pair of missing Marines.

After a federal witness is killed, the US attorney arrives at the Lightman Group to take the next witness in line, Reynolds, into protected custody. Cal feels that the US Marshals Service cannot protect Reynolds, so he takes him "hostage" and demands that he be able to run the investigation into the witness's death. During his investigation, he finds out that while undercover Reynolds did drugs and killed a man and wants to keep it a secret to avoid prosecution after he finds out that his handler (Alicia Coppola) did not properly report the event. Through his own undercover operation, Cal records the handler admitting that she led Reynolds to believe that everything was all set legally, and the US attorney subsequently takes her into custody. Meanwhile Loker and Torres discover that the original witness was killed after the cell phone that his mistress provided was tracked to his safe house's location.

The Lightman Group helps a teenager who believes he was abducted as a baby, while Loker and Torres try to figure out what caused a deadly stampede at an electronics store.

When a pregnant girl is found murdered, Cal and the LMG team help Torres try to clear her juvenile-delinquent sister of charges, and protect her from the real killer.

The Lightman Group investigates when a young woman is killed at a political rally in Virginia.

Lightman, Foster and Reynolds travel to Las Vegas to help locate a missing finalist in the World Series of Poker. Lightman uses his skills to read the other competitors' faces to figure out which one knows about the disappearance. Meanwhile, Loker and Torres analyze Loker's new relationship, and as a result, get closer to each other.

The Lightman Group investigates the murder of a journalist and friend of Lightman’s who was killed while exposing a corrupt politician

Lightman is confronted with unsettling truths about his past while trying to save an Iraq war veteran.

After Foster's boyfriend, Dave Burns (guest star Martini), gets abducted Lightman tries to track him down with the help of Burns' mysterious ex partner.

A fighter in an underground club is found dead; Foster discovers a troubling secret.