"Leopold is just like every other boy in town...except that he can turn himself invisible! Perhaps when he grows up, Leopold will use his powers to fight the forces of evil, but for now, he just wants to have a little fun--sometimes at his sister Celine's expense, other times as her partner in crime. But when Leopold's nerdy classmate Alice finds out about his abilities, her jealousy turns her into a bully whose mission in life is to ruin all his fun. Join Leopold and Celine as they try to outsmart their bully and turn every day into a silly adventure!" -- Back cover.