Lou and Esther are the best of friends. They do absolutely everything together, speak their own language through inside jokes and code words, and share a dreamy curiosity about what their lives would be like had they grown up with a sister. When Lou’s father unexpectedly passes away, she discovers that she has a very real, and very chic, long-lost half-sister, Priya. As Lou begins to explore her relationship with Priya, her and Esther’s codependent bliss is rudely interrupted, creating a rift between them. As the rift threatens to grow beyond repair, Lou must learn to redefine what family is, or risk losing Esther for good.