Lizzie, Max and Dan have never liked their neighbours, the fussy and nagging Potwards, so when it appears that Lizzie's magic potion has made them move out, the children should be delighted. Their glee is short-lived, however, as they worry over who might move in, and more magic seems necessary. Soon the three children are caught in a web of secrecy and conspiracy as one spell leads to another, each more powerful than the last. And then Max decides to cast a spell of his own, on his very worst enemy. . .