During the school day, Lance Garca looks like a typical fourth-grader at Oakland Elementary School. But after school he dons a disguise and becomes the infamous Mister Malo, righter of wrongs, punisher of bullies. He isn't mean or evil. On the contrary, Mister Malo does good things by punishing kids' bad behavior.

One afternoon he receives a compelling plea for help. Isabella Santos spread a rumor that Madeline Wilson farted on the playground, and now everyone makes farting noises when she walks by. She's become a laughingstock. Madeline offers Mister Malo a large box of tropical-flavored fruit snacks if he'll teach Isabella a lesson. Soon Lance is busy plotting the perfect revenge on the bully to make her realize how hurtful her actions are.

But Mister Malo's scheme doesn't go exactly as planned, and meanwhile, Lance has to deal with his own problem in the form of his difficult cousin, Manuel. This entertaining bilingual "flip" book will resonate with kids ages 8-12 in its examination of popularity on the school grounds and dealing with troublemakers.