House is on his cell and leaves a message on Wilson's parents' phone, asking them to call back. The rest of the team wants to talk about Derek, who's got some psychological issues. Adams thinks Grief Avoidance is a thing. Taub tries Hodgkin's Lymphoma. Adams suggests that Derek could have gotten hurt at practice and not told anyone, because he's clearly pretty good at not telling people things. They get to the bathroom, which House has sabotaged. Water is cascading everywhere, presumably because he flushed more tickets.
Park sticks a needle into Derek's back to investigate the spinal fluid. She makes small talk about what Derek hears. She thinks that he hears Christopher's voice to help him deal with it. And then she sees that the pressure in his spine is way too high.
House hangs out at the Chemo Suite. Doctor Thirteen walks up and announces that the Prodigal Daughter has returned. So she didn't just fly in to do an off-set scene with Wilson, then! He offers to off her, which is a fun phrase to say out loud. She says that House should respect Wilson's decision. He fired her so she'd be "forced" to spend the rest of her life doing whatever she wanted. She considers that selfless. "And you don't even like me that much."
House opens the door to Wilson's office and pokes in his cane, on which he is waving a white rag. He enters and announces that he surrenders. He admits that he's been a disloyal jerk. Wilson says he won't let his parents return his call. House says he's made a reservation for two at Carmine's and promises that there are no ulterior motives. I think he looks sneaky in the final shot, but he kind of always looks like that.
Derek's mother enters his room. Adams says they think it might be an extreme migraine and he'll get an MRI soon. The mother sees the picture. Adams tells her that Derek may have been repressing grief for ten years. Derek says that he doesn't even know if Christopher was really like that. With no pictures or video to go on, he doesn't have reliable memories. He asks if his mother could maybe tell him a little bit about Christopher. "I'm sorry. It was a long drive in. I'm going to go get a coffee." Thanks, mom!
Wilson and House are having a lovely meal. Wilson is laughing and crying. House has ordered a platter of Oreos, which is apparently a reference to a camping mishap they once shared. Wilson acts his ass off in this scene and starts to hypothesize about "sticking around for a little longer." House admits that he thinks that's reasonable and drinks some coffee. Wilson looks around and decides that House must have been conning him. House objects to the idea that Wilson couldn't fold on his own without being conned. Wilson says that the whole nostalgia trip was a set-up. House says that he needs Wilson because he doesn't know what he'll do without him.