age 9+ Teens race to big cities to foil bombers in thrilling sequel Parents need to know that Europa is the seventh book in James Ponti's Spy Kids series, featuring the daring exploits, genius talents, and blended-family struggles of seven teens—the two long-lost kids of spy mentor "Mother" (a guy) and the five kids from Rwanda, Brazil, Australia, Nepal, and the U.S. Mother's built the family into a formidable team over the previous installments.