Back at the Fringe lab, Walter is dripping some liquid on the still-living virus. Peter thinks he's giving it LSD too, which Walter gets all indignant about: "LSD, why would I ..." then he remembers why Peter would ask that, so he explains that it's a decongestant. "She is a giant cold virus, after all." Two things: a) That doesn't make any sense, and b) "She"?

Hey, it's a rare Charlie visit to the Fringe lab! He pulls Peter aside to tell him that Olivia's got a lead on her abductor, but he can't help her. Peter asks why not. "Suffice it to say that sometimes a problem with being in law enforcement is that you gotta obey the law yourself," says Charlie. Peter gets it: "You think I'm the guy to break the law for you?" Surprised by Peter's quiet indignation, Charlie apologizes, but Peter lets him off the hook and asks him what he needs. A wiretap, says Charlie. On "Mitchell Loeb, FBI." Fringe spinoff!

Back at LOEB RESIDENCE, Olivia's broken out the lockpicks to get inside the house, but she doesn't get too far before a quite confused Samantha Loeb strolls up. Olivia steps back and quickly says that she was just in Marlborough and thought she'd drop by to see if she's OK. "I don't understand," says Samantha, and Olivia says she hadn't talked to her since Mitchell's surgery. "Oh, how sweet of you," says Samantha, not adding, "That doesn't explain why you were PICKING MY LOCK," but I guess she didn't see that. She invites Olivia in for tea.

Inside, Olivia uses her impromptu cover story as the basis for asking questions about Mitchell and his recovery, and Samantha changes the subject to ask what Olivia was doing in Marlborough. Working on a case," says Olivia. "What's the case?" asks Samantha. "Suspicion of a double agent," says Olivia, sucking all the air out of the room. Way to overplay your hand, Dunham. The kettle whistles, and Samantha coldly says she'll get the tea and Olivia excuses herself to go to the bathroom.

Meanwhile, Charlie's on his cellphone talking to a buddy, getting instructions. After hanging up, he explains to Charlie that his friend used to work at the phone company: "I never really understood why. The guy's a genius." Charlie makes a crack about how he wouldn't want to waste any of that potential, and maybe Charlie should take his attitude and hit the road instead of making fun of the person doing his dirty work for him. Anyway, the phone's been tapped, and Peter says they should be able to pick up any outgoing calls made from the home.