Genius septuagenarian Madeline “Matty” Matlock, who, after achieving success in her younger years, decides to join the workforce at a prestigious law firm, where she uses her unassuming demeanor and cunning tactics to win cases and expose corruption within. Matty is assigned to Olympia, a senior lawyer and key rainmaker with a thirst for justice, while Olympia’s ex-husband, Julian, the son of the firm’s boss, is intrigued by Matty and his clever skills. Matty works alongside the firm’s young associates — the charismatic Billy and the highly ambitious Sarah — as she tries to settle into her new high-stakes world.