In this lighter-than-air Victorian school story, young Emmaline Cayley, consigned to Yorkshire’s forbidding St. Grimelda’s School For Young Ladies, Est. 1552, forms several alliances, including one with a startlingly bloodthirsty Indian princess, while outside her proudly “indestruckable” friend Robert Burns (aptly dubbed “Rubberbones”) joins a quirky crew of adults to plot her rescue. That rescue turns out to be tougher than expected as the school is defended not only by its evil headmistress Malvolia Wackett, but also by a pair of trained pterodactyls. Still, after many reversals, the deed is done at last, with the help of unexpected aid from schoolmates, a large kite and a stash of gloriously unpredictable fireworks created by a mad American inventor. Slavin’s frequent, fluidly drawn ink sketches portray the cast members with just the right degrees of sympathy or savagery. An entertaining mix of high and low comedy: Expect sequels, and look forward to them. (Fantasy. 10-12)