Greta Gerwig plays yet another of her many quirky riffs on the same millennial character she seems to always play on film. It's just more of it in Mistress America, starring as Brooke, a young woman with big ambitions to make something of herself as a restaurateur in Manhattan, but finds that just willing things into existence doesn't always make you a success. A misfit Barnard College freshman with literary ambitions named Tracy Fishko is set to become her stepsister when her mother is engaged to marry Brooke's father, and she wants to meet her new family and hang out for a bit with her, and make a new friend. After getting to know each other, Tracy becomes extremely enamored of social butterfly Brooke, as she becomes a new role model for everything she wants to be in life. A burgeoning writer, Tracy begins to compile their adventures and misadventures into a short fictional narrative, striving to understand this enigmatic but captivating woman from the inside out.