21. A Trip to the Dentist

The episode opens in Havana, Cuba. Keith (Enrico Colantoni) surprises a now-bearded Duncan (Teddy Dunn), who denies killing Lilly (Amanda Seyfried). At school, Veronica avoids Logan, but that night, Logan shows up at Veronica's door. Logan apologizes for owning GHB before Veronica informs him about her rape. Logan denies being her rapist, but Veronica says she'll punish whoever it is, even if it's Logan. Veronica talks to Meg (Alona Tal) about the party, and she mentions seeing Veronica being harassed by some boys before she left. Keith returns Duncan to the Kanes before threatening Clarence Wiedman (Christopher B. Duncan).

Veronica approaches Luke (Sam Huntington) about a trip to Tijuana to pick up some GHB; he admits getting the drugs, but he says that he gave them to Dick Casablancas (Ryan Hansen). Luke states that Madison Sinclair was seen writing "slut" on Veronica's car after the party. Veronica confronts Madison, who says that she defaced Veronica's car because she made out with Dick, her boyfriend. However, Veronica doesn't remember this incident due to the effects of the drugs. Veronica attempts to barge in on a fight between Keith and Alicia over Wallace's involvement in the Wiedman case, but her intervention does nothing to defuse the situation. Veronica talks to Casey, who confirms the make out sessions with Dick and Cassidy and tells her that Veronica was also forced to make out with Shelly for the boys' amusement.

Veronica talks to Sean Friedrich and tells him about the girl-on-girl event and that Dick and Beaver took her over to a bed and argued about who should have sex with her. Veronica talks to Dick, who presents a different account of events, saying that he didn't drug her and that he found Beaver with Veronica already. Veronica approaches Beaver, who gives a set of events more similar to that of Sean. However, after Dick and Sean leave, he purports to have run away and vomited before he could bring himself to rape her.

Keith says that he has to leave for an engagement in Vegas. Logan talks to Aaron, but Aaron does not even know Logan's birth date. Veronica talks to Carrie Bishop (Leighton Meester), who says that she saw Veronica having sex with Duncan. Veronica confronts Duncan, who denies the rape accusations and remembers comforting Veronica in her drugged state. Duncan says that the sex was consensual but was nevertheless ashamed of it because he knew that—confirming Veronica's fears—they were siblings. Distraught, Veronica finally shares with Wallace everything she knows.

Keith calls a prostitute in Vegas for an unknown reason, while Veronica apologizes to Logan and tells him about the situation with Duncan. Back in Vegas, Keith talks to the prostitute, Cheyenne, about Abel Koontz, as Cheyenne and Koontz were together at the time of Lilly's murder. Veronica and Logan go into his darkened house, kissing, only to realize too late that Aaron is throwing a surprise party for him—meaning that virtually the entire high school now knows that they are dating.

In response to rudeness from Dick, Logan announces that anyone who has a problem with Veronica can leave; to Logan's surprise, Duncan abruptly exits the party. Madison acts friendly and gives Veronica a cocktail, but Meg warns Veronica against drinking it because Madison has likely spat in it—a treatment Madison calls "A Trip to the Dentist." Veronica confronts Madison, who admits that at Shelly Pomroy's party she gave Veronica A Trip to the Dentist with her own (unbeknownst to her) drugged drink. Unable to unlock his car, Duncan flies into a rage and starts smashing it; coming upon him engaged thus, Meg chastises him and accuses him of still loving Veronica.

Logan and Veronica start kissing but Logan stops to admit his role in Veronica's rape: at Shelly Pomroy's party, hoping simply to get him to relax, he gave Duncan a drugged drink. When Logan leaves Veronica alone to get some alcohol, she notices a camera in the ceiling fan. She investigates further and finds a hidden monitor and recorder, suggesting that Logan was in the habit of using them secretly to record his sexual conquests, and perhaps had planned to film Veronica. She leaves and Weevil gives her a ride home. Arriving home, she discovers her mother has returned and is sitting with her father.