John thinks he's too small. His best friend, Nyra, looms over him and he can't even reach the biscuit tin without his dad's help. But his luck seems to change when he bumps into a mysteriously witchy lady at the supermarket who offers him a pot of magic mushy peas. One spoonful-no more, no less-will grant his wish. But when John eats not one but three spoonfuls, he realises you need to be careful what you wishes for.