After a successful youth, brilliant seven-year-old Madeline "Matty" Matlock decides to return to the working life of a prestigious law firm, where she uses her easygoing demeanor and cunning tactics to win cases and expose corruption from the inside. Matty is assigned to Olympia, an elderly lawyer and rainmaker who is hungry for justice, while Olympia's ex-husband Julian, the son of the firm's CEO, takes an interest in Matty and his clever skills. Matty works with the firm's youngest partners - the charismatic Billy and the extremely ambitious Sarah - as they try to establish themselves in a new, high-stakes world.