Synopsis The Green Hornet, or his true identity, Britt Reid, is investigating sabotage directed against the shipping business of young John Roberts. The Hornet causes the arrest of Max Gregory, an illicit munitions dealer. The Racketeers strikes back by attacking a trainload shipment being made by young Roberts. Reid, masked as The Green Hornet, with Kato driving the "black beauty" pursues the train, boards it at full speed, and attacks the gangsters. But during the fight, Roberts' cars, uncoupled by the gangsters roll back down the mountainside. Will the Hornet be able to switch the track in time? Will Roberts' cars be destroyed?