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Being a sister isn't always easy...but what's the very worst thing about your sister?
Marty and her sister Melissa couldn't be more different. Marty loves her Converse trainers, playing football, hiding in her secret den and helping her dad with his DIY. But Melissa loves Justin Bieber and all things pink, girly, and pretty.
The sisters can manage to live together despite their occasional scraps, but then Mum tells them they have to share a room. For Marty, having to share her bunk beds and lose her private sanctuary turns out to be the very worst thing about having a sister. But the girls soon discover that being too close for comfort can have unexpected consequences, and when an accident happens, the sisters realize they are closer than they thought.