Previously, Lundy's investigation into Trinity actually led him to cross paths with the man, though he only vaguely realized it; Lundy and Deb slept together after dancing around that particular issue for four episodes; and somebody shot both Deb and Lundy as he was walking her to her car. It doesn't look good.
The next morning...wait, the next morning?! Yeesh, that's a long time for Lundy and Deb to be bleeding in a parking lot. Anyway, Dexter is already at the crime scene and is frantically trying to get the doofuses manning the perimeter to let him by. The degree to which Dexter gets honestly scared when he sees a dead body covered by a sheet (uh-oh...) is actually kind of heartening. Dex doesn't have his laminate, though, so it takes Angel finally spotting him to get him in. Angel assures Dexter that Deb's alive, though she's lost a lot of blood, and Dexter runs up in time to see her wheeled into an ambulance. "If Deb dies," Dexter voices-over somberly, "I'll be...lost." LaGuerta shows up and says the paramedics think the bullets went cleanly through her (a good sign), and "it's looking good." Not so good for Lundy, who is indeed the figure under the sheet. It takes poor simple Dexter a moment to realize what Deb was doing with Lundy at 5AM. Angel says Quinn was first on the scene and said it feels like the Vacation Murderers' m.o. Dex moves to grab his kit, but Angel gives him a hand with the social cues and says he should be with Deb.
Dexter moves to leave, his VO noting that Lundy didn't deserve such an ignominious fate. He crosses Quinn who notes Deb's missing wallet and Lundy's missing watch as further evidence they were Vacation Murdered. Masuka is crouched by Lundy's body, lamenting the gunshot wounds to the neck and chest. Dexter is struck by the fact that Lundy was shot twice. His VO finds it curiouser that Deb -- vulnerable and a potential witness -- was left alive. He takes off for the hospital, with Masuka asking Dex to confirm that, despite his and Deb's back-and-forth every day, "she knows..." Aw, Masuka, you're a hornball with a heart of gold. Dex tells him she knows. "We're gonna get these fuckers," assures Quinn. "Not if you're looking in the wrong direction," Dexter voices over.
So Dexter bolts, but Christine shows up. Quinn's in no mood, his partner having just been shot at and all, but Christine's only there for support. Support and, once an appreciative Quinn goes off, to pester Angel for a quote. Which is totally above-board, actually -- she's doing her job and managing not to manipulate her boyfriend while doing so -- but she still manages to be 60% full of shit at all, times. Anyway Angel initially wants to blow her off, but he stops and considers. "On the record," he says, before telling Christine that Vacation Murders suspect Johnny Rose is in the public health database for having syphilis. "Real bad, untreatable, multiple partners. Print that. With pictures" Christine is more than happy to oblige.