McKinley B. "Mac" Thompson, American reporter in Moscow, smuggles out uncensored news under the alias "Comrade X," but hotel valet Vanya discovers his secret. Vanya fears for the safety of his daughter Golubka ("Theodore") and blackmails Mac into helping her leave the country. Mac is happier about his task once he meets lovely Theodore, but can he convince her of his sincerity? The anti-communist humor becomes alternately grim and farcical.