It was a dark and stormy evening in the city, when a man carrying a briefcase alighted from a taxi at the British consulate. He hurried through the driving rain toward the entrance, but failed to notice the figure lurking in the shrubbery ahead, until it was too late. With a gun pressed hard into his back, a Nazi spy wants to take his briefcase, which he believes contains a list of members of the underground. The man fights back and is killed in the struggle. Can a federal agent and the Green Hornet, track down the foreign agents before they can get the list into German hands?