Stepsisters Olivia and Emily are at daggers drawn – until the arrival of their half-sister Rosie, when they briefly unite in their hatred of the newcomer. Rosie can certainly look after herself, though, and cunningly throws secret spanners in the works for her sisters. As the girls grow older, Rosie becomes more and more manipulative and her schemes soon take on a more malicious note. Only when Rosie is on the brink of stealing the family home from under them do Olivia and Emily put their childish ways completely behind them. But is it too late to save their family home?