When The Real Housewives of Beverly Hills gather for a dinner party at SUR, Stassi and Jax witness firsthand that Lisa's high-class friends can be just as spiteful and vicious as their own. Kristen's obsession over rumors that Tom is hooking up with the pretty new bartender leads to a five-girl shouting match on the night of Lisa's dinner.

Stassi's Cabo birthday continues to unravel as Jax crashes her booze cruise and brings uninvited guests. Kristen gives Lisa an ultimatum that doesn't sit well with her boss. After a final night of drinking, Kristen's shocking decision forever changes her friendships.