Emma and Saffie are off to Granny's house for the summer to practise their superpowers. Soon the gnomes are doing the coming gardening, the dolls are to life and the washing-up is doing itself! It's Grandpa's birthday soon, and Saffie decides to use her powers to throw him the best party ever – whether he likes it or not. What could possibly go wrong?
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 power in the naughtiest of ways, Emma has to think fast to save the day!