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.

Mary Ann decides to stay in San Francisco and tells Shawna true. The relationship between Jake and Margot comes at a crossroads. Anna knows a man.

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.

Shawna tries to learn more about her story. Mary Ann helps Sam investigate Anna's past. Benn changes his mind about Michael's house.

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