Rowena and Victoria, daughters to the second son of the Earl of Summerset, have always treated their governess's daughter, Prudence, like a sister. But when their father dies and they move in with their uncle's family in a much more traditional household, Prudence is relegated to the maids' quarters, much to the girls' shock and dismay. The impending war offers each girl hope for a more modern future, but the ever-present spectre of class expectations makes it difficult for Prudence to maintain a foot in both worlds.