Meanwhile, Dexter breaks into Lundy's hotel room so he can find clues about his Trinity investigation. Harry's already beaten him to the punch, of course, and what Dexter finds isn't so much a clue to Lundy's investigation but rather the whole fucking investigation. Dexter explains to Harry (i.e. us) that Trinity as the killer makes more sense in light of leaving Debra alive -- which I kind of don't get, considering killing Lundy represents as much of stepping outside his usual pattern as killing Deb would have been. Not finishing her off seems as odd coming from Trinity as it would coming from the Vacation Murderers. (Or from, say, Anton? Much as I would hate to see that be the case.) But anyway, Trinity seems to be what we're going with (for now). Harry once again makes the fairly obvious explicit: If Trinity tried to kill Debra, Dexter must kill him. "That's MY blood down there too!" he yells, getting awfully proprietary for a manifestation of the subconscious. The first order of business is for Dexter to pack up all of Lundy's materials so they won't get logged into evidence.
At a diner, Trinity sits at the counter and watches a report of "an FBI agent" killed, supposedly by the Vacation Murderers. He's intensely interested, almost nervous, but ultimately inscrutable as to whether he did the killing or not. The waitress fucks up his Denver omelet and Trinity angrily demands she put the order in again, rather than give him the missing diced tomatoes on the side. In other news, every crotchety old man at a diner is secretly a serial killer.
At home, Rita's got baby Harrison on her hip as she tries to hustle the kids out to school and assure Cody that Aunt Deb isn't gonna die (aw). Dexter's phone rings and she tells Astor to answer it, in case it's the hospital. It's not -- it's Dexter's landlord. From his apartment. Rita figures this must be a misunderstanding, but once she's on the phone, we see it's not.