Emma and Saffie are going to stay with their grandparents for the summer to
learn how to use their superpowers. Grandma has powers too, but Grandpa
doesnt, and he definitely doesnt like the gnomes doing the gardening, or the
washing-up doing itself hed rather play with his model aeroplanes. As the
summer passes, the girls are having lots of fun Emma brings a whole dolls
house to life, but all Saffie wants is to cheer up Grandpa so she decides to
throw him the best party ever. What could possibly go wrong?