In some park, Scarface is sitting on a bench off a path that winds around a lake. He's got a pug with him (a living one, not some dried-out hunk of dog jerky). Across the lake, he spots a couple, arms around each other, looking at the ducks.

So he heads over, pug in his arms, while they're trying to take a picture of themselves and he offers to help them. They agree -- commendably not recoiling in horror at the ruins of his face -- and he says they look like they're really in love. The man and woman cuddle close together while Scarface takes their picture. "You guys from around here?" says Scarface. They are -- from Brookline. Then the woman calls to Oliver, a boy of about five playing by the lake. Clearly, involving a kid in the scheme isn't part of Scarface's plan, so he excuses himself and goes looking for another couple. It doesn't take long before we hear a woman offscreen tell her husband to make sure he gets the lake in the background. "I can take that picture for you," says Scarface, smiling, because he gets to kill people today after all.

Back in the lab, Astrid's wearing some kind of nose-plugging apparatus while Walter makes her smell what turns out to be roadkill, and I'd really like to know how it is that Walter has roadkill lying around. It's from a beaver, which leads Walter to digress about how he went "beaver hunting" in the '70s in Eastern Canada. "Of course in those days, 'beaver' meant something else entirely," he says and there are so many levels of horror to this conversation that Astrid's head practically explodes. She wants to know why he's making her smell roadkill. "Because I've been smelling things for the past hour and I've lost my objectivity. Now, are you going to help me or not?" he says. Well, I guess it depends on whether you're going to start telling stories straight out of Hustler or not. Astrid crosses her arms, but you know she's going to help.

Meanwhile, Olivia and Lincoln are going over the case files, with Olivia noting that all of the friends interviewed said the dead couples had very loving marriages. Lincoln, SUPER GROUCHY, is all, "So?" and Olivia suggests the killer is targeting couples who personify the kind of love he wants to have. I suppose that makes about as much sense as anything could. And then Lincoln shoots her a burning look of love and asks if she's OK and if she's not, she should know that he's right there. She smiles and touches his hand and says she knows, but does not in any way appear to be readying herself to remove her clothes, which has to be a disappointment for him.