The class is learning about nocturnal animals — creatures of the night. But Ralphie decides Ms. Frizzle is a vampire, and he's driving the rest of the class batty. That's when the Magic School Bus grows wings and flies into an old castle. If they hang around bats for awhile, will they find out the truth about Ms. Frizzle? Designed to be accessible for younger readers, books in this series are easier to read and follow the plot of the popular PBS Magic School Bus television series — based on the original Magic School Bus books written by Joanna Cole and illustrated by Bruce Degen.