Stassi Schroeder finally has life all figured out...or so it seems. After a painful breakup, Stassi bounces back with an exciting new business deal, an eccentric new boyfriend, and a surprisingly close friendship with former frenemy Ariana. The unlikely pair has put aside their longstanding rivalry to plan an elaborate joint birthday party. However, as Stassi begins to envision happy new chapters in her life and a serious future with her new man, she must battle old insecurities and bad behaviors. Glimpses of the old, vengeful, self-sabotaging Stassi start to show up, posing serious threats to Stassi's happy new life.