Good ol' Senator Van Horn gets hammered in a car accident, and Newton shows up to steal the body. It turns into a gunfight, and Newton winds up shooting the senator in the eye, which is how the Fringe team discovers that the senator was actually a shapeshifter.
Newton tells Fauxlivia that he had to risk exposing himself, because the shapeshifting senator had information that could compromise her. Of course, if Fauxlivia's really worried about blowing her cover, she should quit with the dark eye makeup and glancing around shiftily every chance she gets.
Newton's worried that somewhere deep inside Peter's brain, he knows that there's something different about Fauxlivia, which is kind of funny, given that the other two shapeshifters Newton uses in this episode are both family men who have been married for several years. Still, Peter does go on at the length about the differences in Fauxlivia since she got back from the other side.
Anyway, Walter uses the labs at his new company, Massive Dynamic (where he seems to be regarded as the Michael Scott of the company) to revive the supposedly dead shapeshifter, throwing Fauxlivia and Newton into a cover-your-ass tizzy. Newton activates another shapeshifter, a cop, to retrieve the senator's data-storage unit. The cop succeeds, but because he'd grown too attached to his family, Newton takes him out (and we learn that Newton's a shapeshifter as well).
Peter and Fauxlivia arrive in time to give to chase to Newton, who eventually purposely crashes so he can slip the data disk to Fauxlivia for safekeeping.
Then she jumps Peter, presumably to muddle his thinking on whether she's actually Olivia or not. And in prison, Newton kills himself (with the help of some lethal material slipped to him by Fauxlivia).
In Boston, Peter and Fauxlivia are out for dinner and doing that game that allegedly cute couples in television and movies do, which is look at the other people around them and guess stuff about them, like their occupations and relationship status. As usual, instead of coming across funny and intimate, it just makes the couple seem kind of obnoxious. Although I have to admit that Peter pegging one guy as "Persian Kid Rock" was pretty funny. Fauxlivia is certain Persian Kid Rock is a banker: "His long hair is just his link to his individuality," she says, adding that she thinks they work together, and Peter runs with it and ... Jesus, why am I recapping this? I'd just like to point out that anyone else in the restaurant playing this game and looking at Fauxlivia and Peter might assume they're a couple of obnoxious yuppies who can't bear to look at each other for more than five seconds straight.
Anyway, it eventually leads to Peter saying things that he doesn't realize say more about him and, say, Walter ("We all draw our moral lines in the sand. And unless you can put yourself in another man's shoes, I don't think you can really judge their situations") as well as things that he knows are about himself and Fauxlivia: "You can always tell when a relationship's about to take that next step."
Then he says he had a really nice time (as did Olivia) but despite a moment ago sounding like he expected to get laid tonight, he has to head home lest Walter starts calling the emergency rooms. They get up to go, but Fauxlivia asks for a moment and she goes to the washroom and looks really conflicted, and then steels herself. Psst! It's behind the toilet tank! Leave the gun. Take the cannoli.
Over in Brookline, good ol' Senator Van Horn is pulling up in his big black car next to a lemonade stand run by a couple of young girls who are literally all "Senator Van Horn!" like they could not be more excited for Justin Bieber. But really, is there anything more fun than overpaying for lemonade from adorable eager-beaver neighbourhood kids? Van Horn "forgets" his change, and he's too busy chuckling and looking in his rearview mirror (the girls seem genuinely distressed that he forgot his change) to see that he's about to be broadsided by a truck. I hope the girls aren't too freaked out, because all the police and ambulance folks who are going to show up will need refreshment too. Every cloud, kids. Every cloud.
Over at a hospital, Van Horn is wheeled through the hallway with a nurse wanting to fire up the defibrillator because he doesn't have a pulse, but the doctor points out he's still breathing.