Brilliant septuagenarian Madeline "Matty" Matlock, who, after achieving success in her younger years, decides to rejoin the workforce at a prestigious law firm where she uses her unassuming demeanor and wily tactics to win cases and expose corruption from within. Matty is assigned to Olympia, a senior attorney and key rainmaker with a thirst for justice, while Olympia's ex-husband, Julian, the son of the head of the firm, is intrigued by Matty and her clever skills. Matty works alongside the firm's younger associates -- the charismatic Billy and the uber ambitious Sarah -- as she endeavors to establish herself in her new high-stakes world.