Carrie (AnnaSophia Robb) runs into an old friend at her internship and gets invited to his mother's dinner soiree in Manhattan, but her feelings for Sebastian (Austin Butler) get in her way, until she see him with another girl. Mouse (Ellen Wong) is excited about getting back together with Seth (guest star Kyle Harris), but her worries about being bad at sex drive her to ask Walt (Brendan Dooling) for help. In order to hang on to a favorite spot at the diner, Maggie (Katie Findlay) takes on Donna LaDonna (Chloe Bridges) and her friends. Meanwhile, Tom (Matt Letscher) loses his wedding ring, which makes him realize that Harlan (guest star Scott Cohen) might be right about starting to date again.
