Things grow increasingly tense between Carrie (AnnaSophia Robb) and Tom (Matt Letscher). When Larissa (Freema Agyeman) drops an unexpected bomb on Carrie, Sebastian (Austin Butler) decides he, too, needs to come clean about something. Maggie (Katie Findlay) turns to Walt (Brendan Dooling) when she thinks Pete (guest star Claybourne Elder) is cheating on her, but gets the surprise of her life. Mouse (Ellen Wong) and West (guest star RJ Brown) find themselves in a sticky situation. Elsewhere, Samantha considers leaving the city, and Larissa's wedding to Harlan (guest star Scott Cohen) is out of this world.