House

House finds himself in a strip bar, with no memory of the last four hours. The stripper assures him he just came in and isn't drunk, and notices he's bleeding from a head injury. He has vague memories of someone injured. He goes outside, staggering because of his missing cane, and sees a major bus accident that he was in.



House is at the hospital getting treatment for his concussion along with the other bus passengers, and insists that he saw someone with symptoms, and they are in danger. He first suspects the driver had leukemia, and then a seizure that caused the accident, but the driver is okay. House then prescribes a fake case of meningitis to get the place quarantined. However, House tries to retrace his steps without luck and his team heads back to the ER until he can remember. Before they do, Kutner suggests hypnosis and Chase has the training. Chase takes House back through his memories, first to an empty bus, then to the bar where he was drinking and the bartender took his keys. Amber also shows up briefly, raising Wilson's suspicions. Finally they tap into House's memories on the bus and he remembers one passenger picking his nose, which indicates a tumor. The passenger checks out, but then the driver reveals that his legs are paralyzed.



All tests prove negative but House wonders if a smell might have triggered a memory. Foreman orders antibiotics for myelitis while House starts sniffing the patients' clothing while taking more Vicodin for the pain. The odors trigger a memory and the driver (House's subconscious) questions why House doesn't get treatment. The other passengers appear, including a woman in expensive black clothing who House concludes wasn't on the bus so must be coming somewhere else. Wilson brings him out of it and insists he undergo a MRI, which indicates he's suffering from short-term memory. While Wilson runs the test, he finally picks up that House didn't visualize Amber naked in his hallucinations, and figures that means House has feelings for her despite House's denials. House persists on dealing with the diagnosis, although he can't explain why he's so obsessed with the case. He goes to the cafeteria to work through a list of symptoms but suffers from increasingly severe headaches.



The driver starts recovering thanks to antibiotic treatment but House thinks it's too fast and the driver starts suffering from stomach pains. House suspects Addison but Foreman notices that House is bleeding from his ear. House decides to go into sensory deprivation to help him tap into his memories. This time Cuddy is on the bus in House's memories and he fanta her in a skimpy schoolgirl outfit. The fantasy of Cuddy starts a pole dance while discussing the case, and then they're in the strip bar and go through a diagnosis. Fantasy Cuddy finally calls a halt to it since House's subconscious would rather diagnose than fantaabout her, and the driver calls out for attention and suggests he has Parkinson's, although his ear is bleeding just like House's. The Woman in Black appears claiming she's the answer, and the driver prods House into remembering he had a shuffling limp just like someone with Parkinson's. He's interrupted when Cuddy and the others get him out. He tells them to treat for Parkinson's… and then collapses.



House wakes up to find a Nurse Dickerson examining him at home, along with a security guard, and figures they've eliminated Parkinson's. House calls in and finally orders them to run a bagel test to confirm TPP: eating bagels and exercising on a treadmill. After Dickerson takes his cell phone, House steals her cell phone and takes refuge in the bathroom and listens to the driver's breathing, and the driver collapses from the strain. He's wheezing, eliminating House's current diagnosis of TPP



Cuddy calls House back in as the driver has trouble breathing. He realizes the driver has had recent dental surgery, and concludes that he has an air bubble in his gum from the dental surgery that has moved to his heart and caused a myoclonic jerk that moved through his body, causing the symptoms. House seals off the room so they can't move him, then positions the patient to force the bubble to the driver's heard and orders Thirteen to get inject his heart to get the air bubble out. Thirteen ignores Cuddy's orders to stop and goes ahead with the procedure, saving the bus driver's life.



Cuddy takes House home and stands guard so he doesn't leave. He gets up and goes into the living room, only to find the Woman in Black there in his dream. She's wearing a necklace with a fly in resin, and he thinks it indicates a fly in the ointment: something he's missing. He finds a red scarf in his hand and decides he needs to tie it around her leg. She says she's cold and he says to stay with him, and then wonders why he said it. He sees her bleeding around the scarf, then wakes up and tells Cuddy it isn't over: he saved the wrong person.



House explains that he saw something else in someone else, and the crash triggered the air bubble in the driver. She wonders why it matters so much to him, and he suggests that they recreate the accident with hospital staff wearing photos of the patients on their shirts. He gets a memory flash of the woman Cameron represents wearing a locket, and then starts taking Alzheimer drugs to put his brain into overdrive, despite the risks to his heart. House starts to remember the accident and sees the Woman again. She says he knows who she is, and asks what her necklace is made of. He finally realizes it's made of amber, and the woman is Amber, and sees her on the bus just before the impact. He then relives the entire accident and in the aftermath, sees her bleeding from a head wound with a pipe through her leg. He uses her red scarf as a tourniquet on her leg as she says she's cold, but then he collapses as an EMT gets her out of the wrecked bus. He then gets out, his hands covered in blood, and limps to the nearby strip bar.



House wakes up as the team attempts to revive him from his heart attack, and House tries to explain that Amber was on the bus. Wilson realizes he hasn't talked to her since before the accident, and they realize she was the Jane Doe #2, who was transferred to Princeton General.