Callie and Jamie's relationship is tested when they are on opposite sides of a case. Mariana's job is threatened, and she has to decide how far she'll go to keep it. Malika has a new opportunity that could be jeopardized by her legal issues. Davia faces the unintended consequences of her behavior. Alice balances her friendships with Lindsay and Sumi.
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.