After Tom forbids Carrie to see Sebastian again, Carrie snoops through Tom's work files and uncovers some alarming information about Sebastian's past. Carrie decides to confront Sebastian about what she's discovered and is shocked by his reaction. Maggie deals with her breakup with Walt in the only way she knows how and finds some solace from Dorrit Meanwhile, Larissa takes Carrie, Mouse and Seth to an outrageous performance art club in New York City, which leaves them all feeling self-conscious.

Carrie runs into an old friend at her internship and gets invited to his mother's dinner soiree in Manhattan, but her feelings for Sebastian get in her way, until she see him with another girl. Mouse is excited about getting back together with Seth, but her worries about being bad at sex drive her to ask Walt for help. In order to hang on to a favorite spot at the diner, Maggie takes on Donna LaDonna and her friends. Meanwhile, Tom loses his wedding ring, which makes him realize that Harlan might be right about starting to date again.

Impressed with Carrie's creative prowess, Larissa offers her an internship at Interview, but Carrie is torn about whether she should take it. Carrie invites George to the school dance, but when she suggests they leave the dance early, George gets the wrong idea about her intentions. Dorrit, who used to go to the Nutcracker ballet with her mother every year, reluctantly agrees to go with Tom, but he has a hard time filling his wife's shoes. Mouse gets a B+ on an exam and blames it on her relationship with Seth Meanwhile, Donna LaDonna catches Maggie cheating on Walt and blackmails her into keeping Carrie away from Sebastian.