As a modern-day Enola Holmes, Wilma Wallaby is an aspiring 13-year-old detective who thinks her bully of an older brother is trying to murder her, but the game changes when she overhears a real murder being planned at Castle Country, an exciting (but fictitious) Florida theme park. It is a confusing world for teens. They see conflict not only in their lives but in the world. Our hero, Wilma, works through the problems with her brother using smart solutions instead of violence. She discovers there are always better ways for good to conquer evil. Castle Caper is also a mystery: why would Jessica and Peter want to murder Justin? Are things really as they seem?