Joe discovers his parents are spies, which is great. But Joe's parents are in danger which is not so great. And Joe has to go undercover as a girl which is definitely not great at all. Joe (now Josephine) is miserable when he starts his new school in a blond wig, dress and tights. But soon he has a spy mission of his own. Using a host of unusual gadgets, Joe investigates some suspicious goings on. But can he do so without revealing his true identity?