The story of the film is simple. Rapunzel is a princess that has hair that has power to heal and keep people young, but once it's cut, it loses all power. When Rapunzel was just an infant she was kidnapped by an old woman who locked her away in a tower to keep her hair all to herself. Rapunzel grows up thinking that her kidnapper is in fact her mother, and the reason she's locked away is because her 'mother' wants to keep her safe from the hardships of the world. I'd tell you more about the movie but I don't want to ruin it. Let's just say she runs away. Very simple, fairy tale plot.