Peter could hardly believe what he saw. The professor is crazy. That thing will never fly. But Justus put on a helmet and took a deep breath. Who knows, it might be worth a try. Everyone, please get in! An inventor competition is taking place in Rocky Beach, but many things are going wrong and it smells like sabotage. The three ??? Kids offer their help to a slightly eccentric professor and soon find themselves in the middle of an exciting case...