Being a big sister has never been so heroic...Emma and her mischievous little sister Saffie like having superpowers.

It's fun making your dolls come to life, teaching Dad's shoes to dance and playing frisbee with the garden gnomes.

But it isn't always easy keeping their gift a secret. And when Saffie starts to use her powers in the naughtiest of ways, Emma has to think fast to save the day!