Vicki announces that her boyfriend, Brooks, is living with her; Heather builds her dream house; Shannon and David try to repair their broken marriage; newcomer Meghan King Edmonds is ready to play ball; Tamra undergoes plastic surgery.

Shannon and David are pushed to the limits on the final day of their couples retreat. Meanwhile, Vicki holds court over a fiesta party, where Heather introduces her gal pal Meghan, and Vicki and Tamra's rocky friendship turns even more complicated.

Heather and the ladies travel to Napa to celebrate the launch of her new sparkling wine Collette. OC transplant Meghan is excited for her first trip to wine country, but is also apprehensive after her recent run-in with Shannon. Shannon continues to struggle with her emotions regarding her husband David's affair. Also, Tamra reveals her newfound relationship with the lord while also trying to draw some much needed attention to her new boobs.

A trip to Napa concludes with tensions at a high. Vicki and Brooks consider some unconventional cancer treatments, Meghan puts the final touches on her first OC charity event while Heather faces the harsh reality of going over budget on her dream home. Shannon receives some shocking news and unresolved issues between her and Meghan become the topic of the ladies' scrutiny.

Vicki receives a telephone call that changes everything. Shannon offers an olive branch to Meghan.

Vicki's mother's passing has sent shock waves throughout the OC, causing the women all to take a deeper look at their family lives. While Vicki travels to Chicago to mourn, Tamra heads north to celebrate the birth of her granddaughter. Meanwhile, Shannon continues to heal her marriage with David. Meghan tries to create a lasting memory for her stepdaughter Hayley.

Vicki enlists the powers of a medium to try and communicate with her mother. Shannon discovers that to lose physical weight, she has to do more than just exercise, she must deal with the weight of her emotions too. Meghan tries to teach her step daughter responsibility but learns a lesson about parenting instead. While Tamra and Eddie struggle to work together at the gym, Heather is eager to start a new project with Terry. All the ladies come together for a fun night of bowling and a surprise announcement.

Meghan hosts a game night for couples, but gossip flies when her husband is absent. In other events, Shannon and David visit their therapist, and the ladies depart for a tropical getaway to French Polynesia.

The ladies swim with sharks during a Tahitian getaway, but Meghan discovers that the sharpest bite comes from the O.C. wives. Then, the women split up for dinner, giving Shannon, Vicki and Tamra high time to visit the bar for shots and gossip.

Hung-over from a night of drinking, Vicki and Shannon deepen their friendship by discussing the details of David's affair. Meanwhile, the other ladies head out on an excursion that puts them in deep water. Later Tamra, wanting to get everything out in the open, sparks a controversy over girl code and pot stirring. Meghan surprises the ladies at the final dinner.

Back in the OC, Shannon and David discover that disciplining their kids is easier said than done. Vicki learns that Brooks has made a life altering decision, to stop chemo and try a radical new approach. Meanwhile, Tamra's psychic makes a shocking claim leaving the ladies in disbelief.

Meghan, Heather, Tamra, and Shannon head to NASCAR while Vicki enjoys a birthday getaway with Brooks. Later, Shannon tries to put on a happy face during her birthday dinner with David and her girls. Heather throws a luncheon at her unfinished home, where Meghan confronts the OG of the OC.

Heather's luncheon ends with a bang as Vicki storms off, upset with Meghan for continually questioning Brooks' cancer treatment. Shannon visits Dr. Moon to help deal with pent up resentment. Tamra hosts a wild "Sex Party" that has Heather covered in blood and Vicki going for blood as she not only confronts Meghan face-to-face, but also goes after Meghan's husband, Jim Edmonds.

The day after Tamra's sex party, the ladies are still in disbelief over Vicki's attack on Meghan. Meanwhile, Shannon's kids cook up a plan to improve their parent's troubled relationship. Tamra and Eddie's date night turns sour when she comes clean about financially helping out her son. Plus, Vicki leaves the OC for a visit with Briana in Oklahoma, but underlying tensions about Brooks brings the trip to an explosive end.

When Shannon throws an Aries themed party, Brooks finally gets his chance to confront Meghan face-to-face for her relentless digging into his past. And an off-handed comment by Brooks throws Tamra into a rage.

Shannon's Aries party continues with Vicki and Brooks making an early exit leaving the other ladies questioning Brooks' behavior and Vicki's involvement. Heather and Terry disagree over a design for the new house, while Tamra shows her son Ryan his new home in the OC. Meanwhile, Shannon begins to question her friendship with Vicki.

As Shannon seeks to make sense of her friendships, Tamra looks to a higher source to improve her son's troubled relationship. Meanwhile, Heather's Evine launch in Minnesota takes a turn for the worse as Terry botches the rehearsal. After a trip to the doctor with Brooks, Vicki tries to put an end to the cancer debate, but when Meghan hosts a viewing party in celebration of Heather's big night, a new revelation about Brooks has everyone stunned.

Vicki's daughter visits and delivers shocking information to Tamra over lunch. Also: Shannon confides in Heather and Tamra, thanks to her reconnected relationship with them; and the women prepare for Tamra's baptism in unconventional ways.

In the season finale, the ladies gather together to witness Tamra's baptism, but with the constant questions and confusion surrounding Brooks' cancer, Vicki is the one who feels crucified. And after an evening of avoidance, Shannon and Vicki come face-to-face when Shannon discovers that Vicki has committed the ultimate betrayal.

The reunion kicks off with the Housewives gathering on the couch to rehash the past year. Meghan makes her mark on her first reunion by clashing with Vicki over her step-mom comments and demonstrating what "Judgey Eyes" really looks like. Tamra reveals the heartbreaking family drama she has been keeping secret for the past year. Plus, a Housewife from the past speaks her mind about Tamra's religious transformation and Vicki shares hilarious memories of her late mother.

On part two of the reunion, the ladies get wild and crazy looking back at the best OMG moments of season 10. While Shannon faces scrutiny about her marriage and David's affair, tensions rise when Heather gets heated about Vicki's betrayal of Tamra. Jim Edmonds also joins the ladies on the couch and is put in the hot seat about his marriage to Meghan. Briana makes an appearance and is no holds barred when it comes to her opinions about Brooks.

The reunion concludes as the women and Briana confront Vicki head on with their doubts about Brooks' cancer. Shannon provides shocking details regarding the validity of the PET/CT Scan, Tamra and Heather confront Vicki about the possibility of being blackmailed, and all of the ladies have strong reactions to Andy's taped interview with Brooks. Then, Vicki makes a stunning revelation that has everyone doubting what they've heard.

The Orange County vault is opened with never-before-seen footage from season ten including Shannon's unique ladies lunch, Vicki's night out and Heather's teachable moment to Meghan about the finer points of Botox. In Tahiti, the women experience a wild ride, and back in Orange County, Heather proves the devil is in the details when building a mega home. Plus, secrets are revealed with more reunion footage addressing Vicki's scandalous history with Brooks.