When Wanda brings her new ladybugs to school, she just wants Ms. Frizzle to give her some hints on caring for her insect pets. Instead, the whole class gets a field trip. They find out pretty quickly that lots of insects eat other insects for lunch. There is the eight-legged issue of spiders, too. And when Wanda's two ladybugs get lost, the class is on a mission to save the innocent bugs. But is there more to ladybugs than Wanda suspects?