Brilliant seventy-year-old Madeline “Matty” Matlock, after achieving success in her younger years, decides to return to work at a prestigious law firm, where she uses her humble demeanor and cunning tactics to win cases and expose corruption from within. Matty is assigned to Olympia, a renowned lawyer and a winner with a thirst for justice, while Olympia’s ex-husband Julian, the son of the firm’s director, is intrigued by Matty and her clever skills. Matty works alongside the firm’s youngest associates, the charismatic Billy and the ambitious Sarah, as she struggles to make it in her new high-stakes world.