After being jilted by her fiancé, Margaret manages her loneliness by obsessively and compulsively organizing her already perfect home. But when her older sister, Josephine, and ten-year-old niece, Hannah, arrive unexpectedly for what seems an indefinite visit, Margaret's carefully structured life is thrown into disarray, forcing her to adapt to the duo's free-spirited lifestyle and to confront the years of estrangement. But just as Margaret begins to embrace her new family, she discovers the truth behind Josephine's visit.