Drama "Silent password " is a description of the espionage drama during the war of resistance against japan! Tells the story of the largest metropolis of the Far East by the invading Japanese troops occupied Shanghai, the Japanese army under severe attack, here in the battlefield behind enemy lines, use their special identity, lurking in the special organs or steal information, beneficial, and puppet 's traitor and spy Zhou Xuan, from the battle of wits, and in between. In the game, among emotion and ruthless will, in Bourne in the interpretation of a scene as if weeping and complaining of the espionage war song, which makes one's blood boils with indignation., can't help sighing.