It's the final party of the summer and the tension between Tamra Barney and her husband, Simon, reaches the breaking point. Is this the end of the road for the Barneys? Vicki Gunvalson's relationship with her husband, Donn, is stronger than ever and as they ride to the party they discuss the carats in the rings they gave each other to commemorate their renewed love. Housewives past and present gather to celebrate the end of another beautiful Orange County summer. At the party, the alcohol is flowing, especially for Lynne Curtin's teenage daughters, Raquel and Alexa. The two girls arrive drunk. Their limo was so long that Lynne claims she was unaware they were even drinking in her presence. Gretchen Rossi and her boyfriend, Slade Smiley, show up at the party wearing coordinating white outfits. The question everyone wants answered is: are they getting married? Alexis Bellino and her husband, Jim, invite the Curtins to join them at their church, hoping it will help the situation with their daughters. Meanwhile, Gretchen looks at Tamra's ring finger tattoo of Simon's name, which is very similar to the one Gretchen has on her own ring finger. As the party continues Tamra is in the midst of a major meltdown and pulls her friend, Vicki, aside to fill her in on her blowup with Simon. She admits that she can no longer tolerate his controlling behavior. What does the future hold for the Barneys?

In the conclusion of a reunion episode, the reconvened Orange County wives recall the good, bad and ugly of Season 5. Andy Cohen hosts.