Word has reached Avakum Zakhov that legendary British secret agent codename 07 is coming to Bulgaria to kidnap the Soviet physicist Trofimov who has recently made a revolutionary discovery that can hand to the Soviets an invincible weapon. Zakhov is given the mission to stop him however necessary.
Note: in the Bulgarian version, Zakhov foils 07 and lets him go defeated. In the English version, Zakhov tosses 07 off a cliff to his assured doom.