Then he starts talking about how every aspect of these cases is classified. Olivia's all "duh" except for the fact that she blabbers about it to anyone who'll listen. Broyles says certain private individuals, like Nina Sharp, have limited clearance. He wants to know if Nina told her anything about the Pattern: "Did she comment or mention anything about the details of your investigation?" Yeah, she said you were a good man, says Olivia. Anything else? "She offered me a job," says Olivia, who jokes that her response was Broyles was going to give her a raise.
Back at Walter's lab, Peter's pissed at having to sign a clearance form that involves him giving up his freedom from unlawful search and seizure. Good thing they're having the Fringe crew sign these after they've started investigating. Peter won't sign, but Walter will (Peter says it's because he's got nothing to lose, since he's already committed to a mental institution. I can't even IMAGINE talking to my dad like this all the time.
Peter stomps off, and Walter says Peter filled him in on Penrose and his "son." "It's one of the inherent pitfalls of being a scientist, trying to maintain that distinction between god's domain and our own." Olivia smiles at him. "But then you already know that," adds Walter. "What do you mean?" she asks. He says that if she's read his file, then she knows the truth about Peter's medical history. She tells him that there was no medical history in the file, just Peter's birthday. Discombobulated, Walter says he was going to ask her to keep it between the two of them, but... Olivia just stares at him.
Later, in the hotel room, Walter's mumbling numbers to himself to lull himself to sleep. It doesn't appear to be working, plus it's keeping Peter up. As you can imagine, Peter is very tolerant of this particular tic of his father's. But then, sweetly, he starts singing "Row, Row, Row Your Boat," and Walter drifts off to sleep. The last thing we see -- is it in Walter's head? -- is a row of bodies in what looks like a lab.