Comrade X.

American reporter McKinley "Mac" Thompson (Clark Gable) secretly writes unflattering stories attributed to "Comrade X" for his newspaper. His identity is discovered by his valet, Vanya (Felix Bressart), who blackmails Mac into promising to get his daughter, a streetcar conductor named Theodore, out of the country. Theodore agrees to a sham marriage so she can spread the message of Communism to the rest of the world.