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- 5.364792E8
- 5.049216E8
- A controversial South Korean ambassador is presumed to be an assassination target at his son's state wedding. The Lightman team is sent to prevent the murder. The son is shot instead and Lightman exposes long-held family secrets and lies in order to identify the killer — the jealous ex-husband of the son's wife who was using the potential threat at the lavish affair as a cover.
- After Foster's boyfriend, Dave Burns, gets abducted, Lightman tries to track him down with the help of Burns's mysterious ex-partner.
- 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. They find the body of a poker coach who was banned from Vegas. Lightman and Foster investigate, while Reynolds plays the tables. Foster also tries to keep a leash on Lightman's fascination with all things Vegas. Meanwhile, Loker and Torres analyze Loker's new relationship, and as a result, get closer to each other.
- Guest stars James Marsters, Allie Gonino and John Carroll Lynch.
- An FBI agent, Ben Reynolds, enlists the Lightman Group in the hunt for a serial rapist. Lightman is slightly disadvantaged by the skills of lying demonstrated by a former serial rapist whom the suspect is thought to be copycatting. Lightman breaks his cool, as Torres doesn't follow his rules, while Foster is put in jeopardy. The entire team all work on this case, as the clock ticks to find the serial rapist. Ben Reynolds is made part of the Lightman group at the end of the episode.
- 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.
- The Lightman Group is hired by Cal's ex-wife, Zoe Landau, to help with an arson case.
- Lightman and Torres team up to interrogate a notorious and imprisoned gang leader who claims to be rehabilitated. If the gang leader is freed on parole, he might help fight inner-city violence or return to his life of crime. Foster and Loker investigate the death of a firefighter who was killed in the line of duty. He may have been murdered in a hazing prank gone wrong, but it is revealed that he violated a fireman's code by sleeping with the chief's niece.
- A protesting farmer called Harold Clark parks his tractor, which he claims is filled with explosives, near the US Treasury building. The FBI sets up its command center in the Lightman Group offices, and Lightman tries to find out if there is actually a bomb in the tractor. The FBI wants to blow up the tractor and kill Clark, just in case Lightman cannot find out for sure. Meanwhile, Loker plays babysitter to third-graders stuck in the Lightman Group office, and earns a kiss from their teacher.
- Guest stars Melissa George, Richard Burgi and Sheryl Lee.
- Guest stars: Michael Goorjian, Jason Gedrick, April Grace and Mark Rolston.
- Enver Gjokaj guest stars.
- Guest star Pavel Lychnikoff, James Frain.
- Guest star Victoria Pratt
- Guest starring: Meta Golding.
- Melissa George guest stars.
- A young woman approaches Lightman at his book signing, believing she has psychically 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.
- When a wealthy woman attempts suicide in the office of the leader of a self-help empire her daughter hires Lightman to investigate the cult-like leader. As Lightman gets closer to the truth about the self-help guru's past threats are made against Lightman and his daughter.
- Lightman begins to question his own sanity while he tries to get a patient released from a mental hospital.
- The Lightman Group investigates the disappearance of a young woman, which leads them to uncover a criminal element in the adult film business.
- Lightman helps a traumatized soldier who got back from Iraq and who thinks that someone is trying to kill him. Lightman exposes the real truth of what happened during the episode that earned the soldier a Silver Star.
- The murder of a teenage girl who is the daughter of a powerful federal judge leads The Lightman Group to a highly competitive college-prep school where getting to the head of the class means everything. Lightman discovers that a fellow student killed her to protect her involvement in an SAT cheating scam. Foster investigates a NASA test pilot accused of intentionally crashing a $250 million aircraft.
- While giving a lecture to his mentor's graduate students, Lightman meets Martin , who mocks Lightman's work and then beats his deception techniques, twice, in front of the class. Since it seems that Martin is aroused by images of torture yet disgusted by images of sexy women, Lightman concludes that he's a psychopath and possibly a murderer, but Lightman's mentor and the university and even Foster wonder if Lightman's just upset that Martin beat his system. As Lightman grows more sure of his hunch, and learns that a girl has gone missing, he begins to stalk Martin and even puts up posters to warn the other girls on campus. Foster fails to see the clues Lightman is sure of, and he gets a little ruffled when she doesn't support his claims. Eventually Lightman sets a trap--only to have Martin, "five steps ahead," kidnap Lightman instead. In the B plot, Loker and Torres look into a UFO sighting by a science teacher whose job is at stake due to his claims. Loker and Torres follow the trail resulting in an encounter with Air Force Colonel Gorman
- Lightman is hired to investigate three high school students responsible for a fatal traffic accident, which takes a turn for the better when he finds the heroic paramedic who was first on the scene.
- Lightman is called upon by a prosecutor to testify as an expert witness in the trial of a beautiful widow accused of murder. The widow is accused of murdering her much older billionaire husband. She is also accused of having an affair with her step-son and stealing from her husband's company. It is a national case that pits Lightman, working for the prosecution, against his ex-wife, who is the defense attorney in the case. Foster, meanwhile, coaches the prosecution witnesses on how to behave on the stand, and how to engage the jury. Loker and Torres discuss her involvement with an older person.
- Guest stars Tomas Arana, Erika Christensen and Michael Raymond-James.
- The group investigates a controversial case about a cop who shot a teenager and the threat of a terrorist attack. Meanwhile, the Lightman Group is supposedly "sued" relating to the multi-million dollar scam, but it was actually a test for Torres' loyalty to see if she would reveal what Loker did . Loker is made an unpaid intern near the end of the episode by Lightman, instead of being fired as he was expecting.
- When a pregnant girl is found murdered, Cal and the Lightman Group team help Torres try to clear her juvenile delinquent sister of charges, and protect her from the real killer.
- In the course of defending a wrongly accused man Lightman uncovers a secret within a teen beauty contest.
- Lightman is hired by a wealthy woman to look into her new boyfriend's background.
- One of Foster's former patients turns up dead shortly after expressing concern that she is being squeezed out by a business partner.
- The Lightman Group helps a teenager named Max 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. Max then brings the people he believes that are not his parents to the Lightman Group to be monitored to see if they were telling the truth. The parents are outraged at the boy's allegations and leave. Lightman and Foster then go to the parents of the missing child, but the mom seems to be lying and the mom admits to accidentally killing the baby James. Max's parents finally admit the truth to him, which leads Lightman and Foster to go on a hunt for his biological parents. Loker and Torres continue to investigate the electronics store stampede to determine who caused it and if the store is at fault. Torres believes that Loker is trying to impress Lightman to get on his good graces so that he will go back to his old position in the company and not an unpaid intern. While Loker celebrates his believed success, Torres continues to investigate the stampede.
- An old friend of Lightman asks him to look into a death caused by a new experimental drug. Foster and Loker help the US government negotiate the release of two Americans about to be executed for possession of narcotics, while the US government attempts to hide their secrets from Foster and Loker. Also Lightman begins to take notice into Foster's husband's secrets.
- After Lightman's former Pentagon colleague is killed in a car bomb, Lightman and Foster are forced to revisit a series of events from their past, including the therapy sessions that brought them together. Parts of Lightman's past including his run-ins with the IRA are revealed.
- Lightman is obsessed with his investigation of two women who commit suicide — he is assisted by Torres; Foster and Loker try to recover millions of dollars for investors who were scammed. Lightman's secrets begin to surface, while Torres attempts to figure them out.
- A baby goes missing, and her mother accuses an unknown person of the kidnapping. When Lightman sees she's hiding something, he digs deeper and discovers a family in need of repair.
- Dr. Cal Lightman is the world's leading deception expert who studies facial expressions and involuntary body language to discover not only if someone is lying, but why. Lightman and his team of deception experts assist law enforcement and government agencies to expose the truth behind the lies. The son of a family of devout Jehovah's Witnesses is accused of killing his teacher after being caught fleeing the scene of her murder. Meanwhile, the team is hired by the Democratic National Committee to investigate a second case in which the Chairman of the House Ethics Committee is accused of paying for sex.
- The Lightman Group investigates when a young woman is killed at a political rally in Virginia.
- While investigating a building collapse, Lightman discovers a massive cover-up. Meanwhile, a billionaire asks the team to determine if his girlfriend loves him for the right reasons and convinces Loker and Torres to take the case by the large sum of money he is offering to the company.
- When a female soldier accuses her platoon leader of sexual assault, Lightman is brought to Fort Meade to find out if there's any truth to the accusation. The woman is found to be covering for someone else. Lightman tricks the Staff Sergeant into admitting that he coerced sex with a soldier by threatening to give her the most dangerous assignment. Meanwhile, Foster investigates whether a high-profile basketball recruit accepted bribes to play for a university.
- The Lightman Group's expertise is called into question when a woman plays cat-and-mouse with Cal while he's checking for security leaks at an art museum prior to a major exhibition.
- Foster and Lightman investigate a potential abduction of an 11-year-old girl. During the investigation, the audience learns more about Gillian's private issues. Ria and Eli try to find out whether a renowned peace activist is really who she claims to be. However, Eli is attracted to the woman, which interferes with his professional opinion, but eventually relents and is the one who took a confession from her, after he has doubts on her story's credibility.
- Lightman and Loker investigate a mine explosion, while Foster and Torres work with the FBI.
- The Lightman Group investigates the murder of a journalist and friend of Lightman's who was killed while exposing a corrupt politician—a case that tests Lightman's relationship with Reynolds and the FBI. Reynolds is shot during a field trip with Cal to a train station. Meanwhile, Emily's newfound interest in dating makes her father uncomfortable.
- Lightman attempts to stop a man from robbing a bank by helping to plan and execute it. Meanwhile, Foster and Lightman get into an argument over who is in charge of running the company and a new intern is hired to replace Loker. Jamie Hector also guest stars in the episode.
- 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.
- Internal Affairs investigates an incident involving Detective Wallowski . The Lightman Group is hired to review police profiling techniques.
- While investigating the murder of a police officer, Cal discovers a conspiracy that could threaten his daughter. Meanwhile, Cal must get the Lightman Group out from under a financial crisis.
- Domestic terrorist bombings are occurring across the Washington, DC area sending everyone in a panic. FBI Agent Ben Reynolds calls on The Lightman Group to help identify those responsible and prevent more attacks. Lightman finds that the bombs were detonated remotely and that the bombers were set up by someone else. The case takes a personal turn for Torres when Dupree goes missing. Lightman decides to hide the news from Torres so she can remain focused on the big picture. Zoe helps Lightman with the investigation and both are concerned about their daughter's safety.
- Actress Felicia Day guest stars as the third-graders' teacher. Miguel Ferrer guest stars as FBI ASAC Steele, Ben Reynolds' boss.
- Eric Matheson 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 Torres' 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 Matheson, asking him to let all the employees go as long as he helps prove Matheson's innocence. Matheson complies, and Foster, Loker, Reynolds and Torres attempt to solve the case, while Reynolds has second thoughts about not calling the authorities. Cal and the team find out that Matheson was actually innocent and that his wife was actually killed by a loan shark. Matheson demands to see the loan shark, saying he will either take his life or Cal's. Cal pleads for Matheson to kill him, but Foster, Loker and Reynolds trick Matheson into letting his guard down after a disguised Loker pretends to recount the last moments of Matheson's wife's life. As Matheson takes aim on Loker, Reynolds draws his gun and shoots Matheson, disarming him. The episode ends with Lightman at Foster's home, asking if he could sleep in her spare room for the night.
- Cal's old friend Terry Marsh attempts to pull him into a criminal conspiracy after he settles Terry's gambling debts. The criminals abduct both Cal and Terry and try to recruit Cal to be their personal lie detector, forcing him to determine the validity of a client's counterfeit bills. Over the course of the episode, it is revealed that both Terry and Cal got into trouble with the police when they were young, and that Terry volunteered to take all the blame, allowing Cal to continue with his life. The event ends with an FBI raid, and Lightman tells Terry that they're even. Meanwhile, the Lightman Group probes murderous threats against a high school. They determine that the threats were made by Stacey, an overweight student, who is suicidal due to emotional attacks by her classmates and gym teacher. After Stacy attempts to overdose in the bathroom of the Lightman Group, it is revealed that the gym teacher instigated and participated in the emotional attacks against Stacey. Jasmine, one of the bullies, gives a genuine apology to Stacey, and corroborates Stacey's accusation. The gym teacher is arrested for obstruction of justice because he received the threats and did not report them
- Lightman is hired to solve the murder of a woman whose father is on his deathbed.
- A street fighter is murdered and Lightman is the prime suspect. The clock ticks as the Lightman Group must find the real killer before Lightman ends up behind bars.
- 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 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.
- Lightman becomes intrigued with a woman suffering from Alzheimer's disease, who is convinced "Charlie" killed her sister. He pieces together her memories to find out the truth.
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