Justin (Jordan Gavaris), a recently divorced gay man, brings Billie (Madison Shamoun), the biracial daughter he gave up for adoption, to the lake where he summered as a boy. Justin hopes spending the summer together with Billie will bring them closer. Still, Justin's obsession with wresting control of his family cottage back from his stepsister Maisy-May (Julia Stiles) only pushes them further apart. It will take a lot of growing up for all parties to learn how they fit into a family, including the Iron Lady of the lake, Maisy.