After two decades away, Mary Ann arrives in San Francisco for Anna Madrigal's 90th birthday party. But not everyone is happy to see her.

Anna receives a threat. Mary Ann tries to make amends with Brian. Jake and Margot go to the party where Jake's Sister is going to reveal the sex of her baby.

Mary Ann asks everyone to help Barbary Lane and tries to get along with Shawna. Michael spends the night with old friends and argues with Ben.

Mary Ann and Shawna team up to investigate Anna's problem. Michael is looking for a new house. Shawna opens up with Claire.

Everyone looks for Anna after a health problem. The twins bring together social influencers at DeDe's house. Mary Ann and Brian have a candid talk.

Racing against time, Mary Ann, Michael and Brian follow leads to learn who's threatening Barbary Lane. Anna seeks forgiveness from an old friend.

The conflict at Barbary Lane comes to a head. Jake and Margot clear the air. A night of celebration leads to an unexpected discovery in the morning.