Fourth-grader Katie learns about nocturnal animals firsthand when the magic wind turns her into a bat during a class trip to the zoo.

As Halloween approaches, things are getting spooky at Beebe Bluff Middle School. When Connie starts a rumor that a vampire is in their midst, Doug and his friends fear for their safety. Then Doug spies his best friend Skeeter, up in the tower with the bats, and everybody is convinced this could only mean one thing. Is Skeeter really a vampire, the true Bat Master? And who will be his next victim?