The creature called Man-Bat escapes Arkham Asylum with a secret weapon and a sonar shriek that makes citizens turn batty, and it is up to Batman to keep Gotham City from becoming a city of bats. Written in graphic-novel format.
Danny Dragonbreath and Wendell travel to Mexico to visit Danny's bat specialist cousin, but when a giant bat monster kidnaps Danny, Wendell gets his chance to play hero and save his friend before the bat monster makes Danny a permanent addition to her bat family.
"This easy-to-read nonfiction story tells a "night in the life" of a bat, from waking up, finding food, and taking care of babies, to going back to sleep when the sun comes up"--.