The team discovers a long festering secret which sets off a deadly chain of events when they investigate the disappearance of the teenage son of a Secret Service man.
Thirteen brings her one-night stand to the hospital after the woman has a seizure. However, the woman admits she slept with Thirteen just so she could get to House and have him diagnose her condition. Meanwhile, House continues to pay Lucas to spy on Wilson.
A local priest may be protecting drug dealers; Dutch and Billings close in on attempted cop killers; Corrine learns uncomfortable truths about Vic.
The team investigates a woman that re-appears after weeks of being missing with a rare disease. She also inexplicably causes pain and death to the people she meets. During the investigation, dangerous level of radiation are detected. Walter obsesses about cotton candy; Peter strikes a deal with Nina Sharp; and a truth about Olivia is discovered.
This episode demonstrates the production processes for microphones, hot tubs, artificial turf, beer steins.
When the team learns that a wealthy investment banker found murdered inside his locked safe room was living a dual life and skimming millions from clients, Patrick Jane sets up a mental conundrum to see which of the suspects will show their true colors.
While Sarah, John and Cameron track another name from their list, they accidentally cross paths with T-1001. Meanwhile, a woman who Derek once knew in the past surprises him by appearing in the present.
While Horatio and the team investigate a murder at a trendy store, Horatio finds that Julia's instabilities have turned her into a ticking time bomb.
Lincoln works to retrieve the final card, which is being held by the General. Michael and Self are forced to work with Gretchen. Meanwhile, Roland continues to be berated for losing the transcribing device in Las Vegas.
Nathan and Haley must team up to help Jamie deal with a school bully. Meanwhile, Lucas and Peyton continue to adjust to life as a live-in couple. Elsewhere, Mouth tries to get his old job back.
Chuck goes undercover at Sarah's 10-year High School reunion, where they meet the girl that tortured Sarah back in the old days.
Ted and Stella move up their wedding date, but the wedding may not go off as planned after Ted breaks the "No Exes Rule" and invites Robin to come in from Japan for the wedding.
Leonard and his friends stage an intervention to force Sheldon to face his fear of driving.
Vanessa uses the scandalous picture of Catherine and Marcus to blackmail Blair into being a nicer person, so Blair seeks revenge by enticing Chuck to seduce Vanessa. Lily and Bart throw an extravagant housewarming party and expect their children to make them proud in front of the attending press, but a rebellious Serena isn't ready to play by their rules. Meanwhile, Dan and Jenny discover a big secret that Nate has been keeping from his friends.
Alan and Shirley prepare for a fight with the military on behalf of a man whose brother died under suspicious circumstances. Meanwhile, Jerry helps his sister in her search for the identity of the father of her son, who was conceived through an anonymous donor.
Charlie tries to help Jake's former teacher, who became a stripper after dating him, but things go from bad to worse when she has a religious conversion.
Villains Knox and Daphne are on a quest to recruit Hiro and others to the Pinehearst fold. Angela and the Company are paralyzed from recent events. Peter goes to Pinehearst searching for answers but is stunned to learn who the founder is. Claire and Sandra go on a mission to save Meredith from the clutches of Doyle, a villain with abilities to control people mentally and physically. Nathan and Tracy try to trace their origins with Mohinder's help.
Tim and Tarquin's family has outgrown their house. The lack of bedrooms and angled walls on the main floor have them wondering what to do. Designer Hilary and Realtor David want to help the family with their housing problems. Hilary and her team will renovate the major problem areas of the house to make the family love it again. David will search for houses that will convince the family to leave. And after all the work is finished, Tim and Tarquin will have to make a decision about their house. Will they Love It? Or List It?