In the 20th century, Cassie aspires to become the most exceptional copywriter in advertising's history. Despite her youth and the challenges of navigating a profoundly sexist industry, she and her art director craft remarkably innovative work. Their brilliance gains attention, leading them to be assigned to churn out copy for their agency's coveted "mystery" campaign. Can they get Americans to swallow the biggest chunk of bullsh*t this country has ever seen? And who are the winners and losers in this game?