A huge water amusement park is opening near Rocky Beach. There are water slides, fun dolphins, but also dangerous sharks to marvel at. However, things go wrong at the opening ceremony. Sabotage? Justus, Peter, and Bob take on the dangerous mission and dive into the underwater world for their investigation. Then, the detectives head to the safari park on Conga Island. A crazy pilot, wild animals, and an island secret lead the three ??? kids into one of their most dangerous adventures.