In the claustrophobic town of Millerville, Emery Harris lives alone in a treehouse named Mabel surrounded by a dozen or so plants she researches, names, and talks to. Her overbearing sister Hazel is Emery’s only connection to reality, along with her YouTube channel where she documents her studies that have garnered several thousand followers. When her calm and quiet is disrupted by an entourage of devotees chanting and singing to her–their botanical, new-age messiah–she is forced to look down from the branches and face the outside world.