Cassandra, the 17-year-old narrator, lives an eccentric existence in a crumbling castle in the English countryside in the 1930s. Her father is a former bestselling novelist now suffering from a chronic case of writer's block and her glamorous but bohemian stepmother Topaz is a sometime artist model. Money is in short supply but Cassandra and her discontented older sister Rose are forced to make the best of things - until some young, wealthy American neighbours arrive and Rose sees an opportunity for them all to escape their impoverished existence.
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