House puts a well-known medical researcher through a battery of tests to determine why he collapsed in his lab. When the team is unable to diagnose the problem, the doctor asks the team to help him end his life. House is forced to use his cane again after the ketamine has worn off as he deals with a clinic patient's teenaged daughter who has a crush on him.

When Ziva accidentally witnesses a political assassination, she must surrender to the FBI and deal with the consequences without Gibbs's help, who is now enjoying his retirement. She learns that the FBI is looking for her and escapes, while the NCIS team, led by Tony, must prove that Ziva is innocent. However, when things get more complicated, Ziva seeks help from the one person who always trusted her, Gibbs.

Erica introduces herself as George's partner to Vincent and Cully. Claudia breaks up with Christoph. Daniel attacks Chirstoh and says he knows that he was trying to kill him when Penelope was accidentally killed. Andrea convinces her father, Harold, to get Detective Hawkins to reopen the case. Cara tries to get her father not to hurt Louis but Joey tells her that Louis crossed the line and has to pay. Andrea admits to Kate and Jessica that she is in love with Louis. Harold fires Louis. Louis asks Andrea to leave the city with him as Vincent and Cully get information on their whereabouts from Erica.

The ten remaining celebrities take on the mambo and the quickstep.

Goren and Eames investigate the death of Heidi Conington, a former ambassador's daughter, and then the similar murder of Jenna Shea not long after, interviewing her roommate Jo Gage. Jo's father turns out to be Goren's former mentor, Dr. Declan Gage, who tries to convince Goren that the killer is Sebastian, the one killer that he has never been able to capture or forget. Ross warns Goren that he doesn't want Gage, who betrayed his entire team in the original Sebastian investigation, anywhere near the case. When Eames is taken from her home, suspicion turns to Gage, especially after some of her belongings are found in his possession, but when Eames saves herself, she can't give the police any clues to her captor.

What seems to be a textbook child kidnapping becomes a tangled mess when it is revealed that the victim is the daughter of David Lao - an Asian crime lord who is currently under FBI investigation. To save the young girl's life, Matt and Emily must compromise the investigation, infuriating the Crime Division's Chief, and deal with a corrupt father who doesn't want their help. With two FBI teams on opposite sides of the same case and a kidnapper who is more experienced than he's revealing, Matt and Emily have their hands full at work while keeping some secrets from each other in the bedroom.

Sheriff Carter and Zoe are the only ones unaffected when Eureka's residents begin to behave strangely. The father and daughter team search for the cause.

Gene Simmons invests his money into a cattle ranch and ends up losing thousands of dollars because of it.

Denise shocks the firm by announcing her marriage to Daniel Post, who is subsequently arrested for attempting to illegally buy a lung from a fellow cancer patient.
Alan once again defends Jerry Espenson when he assaults a police officer, and attempts to get him counseling to help with his sexual difficulties.
Meanwhile, Shirley is freaked-out when she stumbles upon Denny and his "special doll".

Benson is called in after a young woman shows up at the hospital, raped and beaten with her head shaved. Haley Kerns refuses to submit to a rape kit, but Benson steals her underwear before leaving the apartment and gives it to Warner to check out. When Benson returns to her apartment she encounters Star Morrison, who admits that Haley is a federal informant working with them on eco-terrorism. After Stabler is wounded while out on a search with Morrison, Benson and she work to get information from Haley before the eco-terrorists can strike.

Sean and Julia are looking for a nanny. Sean wants to turn to Christian for support after his hidden desires are revealed. But, Chistian is pre-occupied with his own worries about being too fat.

Bobby is given his next job from Charlie, a secretive woman who seems to have a substantial amount of power and authority. Bobby and his crew are going to head out to Pittsburgh to steal three paintings. Bobby is also trying to maintain his family life while hiding the fact that he is a thief for hire. Hope, who has a dark past of her own, begins to get suspicious of Bobby and his job as a paper salesman.

While doing the job in Pittsburgh, everything is going off without at hitch. that is, until one of the team goes down when shots are fired.

The team is sent to Pakistan to help an undercover operative foil a terrorist attack on many cities.

On the home front, Molly and Tiffy help one of Tiffy's former students and Kim and Bob welcome a new addition to their family.

Tonight actor and star of Hollywoodland Ben Affleck.

Tonight Stephen welcomes New York Times columnist Frank Rich, author of The Greatest Story Ever Sold: The Decline and Fall of Truth from 9/11 to Katrina.