Carole turns fifty and decides to celebrate her birthday with an extravagant, all-out bash. Ramona and Mario prepare for life in an empty nest as they send daughter Avery off to college, while Kristen and Josh seek professional help to put their marriage back on track. Sonja receives an unexpected piece of jewelry and a promise from Harry Dubin , Aviva's ex, but a shocking turn of events rattles their relationship to the core.

Hosted by Andy Cohen, the ladies of NYC -- Aviva Drescher, Sonja Morgan, LuAnn de Lesseps, Carole Radziwill, Ramona Singer and Kristen Taekman -- reunite for the first time since the jaw-dropping Season Finale. Ramona is in the hot seat for her behavior towards Kristen in Montana, and Carole confronts Sonja about spreading rumors about her ex. Plus, LuAnn minces no words telling Sonja exactly what she thinks of her and her sometimes questionable headspace.