Davia's mom comes to town, stirring up old issues. Callie and Malika make some mistakes attempting to help people. Meanwhile, Mariana tries to figure out what to do about the problems from their app beta test and gets confronted by the other women on the grievance committee.
Taking place a few years after the events of The Fosters, Adams Foster siblings Callie and Mariana relocate to Los Angeles to begin the next phase of their lives. As they move into a communal living apartment building called The Coterie, Callie becomes a law clerk working for Judge Wilson while Mariana becomes a software engineer. The two of them navigate their young adult lives while interacting with their neighbors and the people they befriend.