A fast freight loaded with war materials, was approaching a small bridge a few miles from the city. It's passage had been kept secret, and the track was clear so that no time would be lost getting the supplies to the port and awaiting ship. Only a few miles was left until it was to reach its destination, but as the freight approached the bridge, there was an explosion! It was the saboteurs again, who had been attacking munition and troop trains across the country! Can the Green Hornet match their wits to stop them from striking again?