A 17-year-old Brooklyn high schooler, Jackie Kimball lives with her widowed mother, her 18-year-old brother Matthew, and her younger sister Jeanne, while her oldest brother is abroad on a student exchange program. Jackie and Matthew have always been extremely close, but their relationship is complicated by her lifelong romantic feelings for him and his lack of reciprocity. Having until now been content with the existing state of affairs, Jackie has no choice but to deal with the disruption of her idyllic childhood world by the harbingers of adulthood.