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. 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.

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. 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.