They discover a plot by a band of capitalists led by the wicked Chiche (Sergei Komarov). He has organized the assassination of Mend's employer, an American millionaire named Gordon Stern, accusing the Bolsheviks of his murder in order to attack the USSR with poison gas hidden in radio equipment. Without hesitation, the quartet hop on a boat to Leningrad in hopes of stopping the nefarious scheme.
