Harrison Beck and his Uncle Nat are on the journey of a lifetime aboard the Safari Star - a luxurious steam train that will take them from Pretoria to the stunning Victoria Falls. Close encounters with the amazing animals and landscape of Southern Africa are adventure enough, but things get mysterious when a passenger is found dead inside a locked compartment. Is it just a terrible accident or is something more suspicious afoot? It's up to train detective Hal and his new friend Winston to find out.