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When Kate (Orla Brady) is called away from the retirement home she runs to take care of her mother, she is forced to leave her rebellious little sister, Ellie (Hayley Atwell), in charge of the four residents who are staying at the home over holiday break. These four are nicknamed "the hardcore" because of their mean-spirited ways, and they quickly try to break Ellie of her happy-go-lucky demeanor. But both "the hardcore" and Ellie soon discover that they can learn a lot from each other. Wikipedia