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.

When Stassi believes that Kristen committed the ultimate betrayal, she devises a plan to expose her in front of all of her friends. Lisa struggles to keep SUR's working dynamics under control when tensions between Jax, Tom, Stassi and Kristen reach all-time highs.