Three special agents travel to the past to solve every mystery! Carson City, Nevada, 1877. The robber Black Bart threatens to steal a shipment of silver bars on a train bound for Nebraska. If he succeeds, Americans will stop trusting and using trains, and the railroads may cease operations forever: a disaster for history! The Time Detectives must prevent the robbery at all costs. But how? From Egypt to ancient Rome, from the Far West to Prehistory, among hidden treasures and mysteries to be solved, the three Time Detectives are always ready to act.