When Sebastian learns that his mother is getting remarried, he asks for Carrie's dad to make sure she is legally protected. Carrie is furious when she discovers that Weaver has secretly read her journal. Mouse volunteers to help with the Homecoming float, but tries to distance herself when West wins Homecoming King. Samantha finds herself a place to live and another unusual job. Meanwhile, Dorrit begins to feel smothered by Miller, especially when he befriends her dad, and Donna LaDonna gives Dorrit some wise advice.
When Carrie struggles with writer’s block, Weaver tries to help but gets in the way. Maggie and Sebastian grow closer after learning some shocking news. When Bennet moves to a dangerous neighborhood, Walt takes drastic measures to keep himself safe, with both hilarious and heartfelt results. Meanwhile, Larissa and Samantha finally find some common ground: sex.
Carrie is shocked when she reads a nasty rumor about her in a New York City gossip rag, but Samantha has a plan to set the record straight. Walt steps in when Bennet feels taken advantage of at Interview. Mouse, worried that she and boyfriend West are stuck in a rut, does something very risqué. Meanwhile, when Maggie experiences a medical emergency, Sebastian is forced to reach out to the one person who can help.
Carrie is delighted when she gets the chance to interview the CEO of Bongo Jeans – but the pressure is on when Larissa tells Carrie that this is her last chance to land a piece in Interview magazine. Mouse gets some news that drives an unexpected wedge between her and West, and Sebastian’s father delivers other news that could forever change Sebastian and Carrie’s relationship. Elsewhere, Walt finds a surprising father figure in Tom, and Maggie tries to muster the courage to tell her dad the truth about the last few months.
Larissa gives Carrie some harsh advice about her relationship with Sebastian. When Harlan asks Tom to work overnight on a top-secret case, Dorrit decides to throw an impromptu get-together, which quickly spirals out of control. Meanwhile, Mouse and Donna get surprisingly close and Sebastian makes a hasty decision after another fight with his parents.
Walt and Bennet get some devastating news that forever changes their future. Sebastian gets an exciting work opportunity, causing him to bail on Carrie on Valentine’s Day, much to her chagrin. When Maggie accidentally enlists in the army, a surprising duo comes to her rescue. Elsewhere, Tom uses some reverse psychology to encourage Dorrit to start dating again.
When Bennet starts slacking at work, Carrie tries to cover for him. However, when Larissa finds out, things backfire big time for them both. Samantha makes an uncharacteristic decision about her latest fling. Sebastian’s father asks him for a favor that could change Sebastian’s future forever. Meanwhile, Tom is hoodwinked by another – beautiful – lawyer when negotiating a deal, and is advised by the person he least expects.
Carrie, Mouse, Maggie, and Walt decide to go to their senior prom – at The Waldorf Astoria – together for a final hurrah. Larissa offers Carrie an opportunity that makes her rethink her plans for the next year. Mouse learns a secret about Donna LaDonna that could threaten her reign as queen bee. Meanwhile, Sebastian hides a big decision from Carrie.
Things grow increasingly tense between Carrie and Tom. When Larissa drops an unexpected bomb on Carrie, Sebastian decides he, too, needs to come clean about something. Maggie turns to Walt when she thinks Pete is cheating on her, but gets the surprise of her life. Mouse and West find themselves in a sticky situation. Elsewhere, Samantha considers leaving the city, and Larissa's wedding to Harlan is out of this world.