Mylene spends the night with a man who is an Eastern bloc spy, but when he tries to assassinate her she kills him instead. Meanwhile, in the Eastern Bloc, Dr. Soyuz is concerned that his new energy source will be used for war. On the eve of the signing of a nuclear disarmament treaty between the Western and the Eastern blocs, Zero Zero is tasked with assisting Dr. Soyuz to defect to the West. After negotiating as series of false leads and traps, Mylene and Zero Zero retrieve the data and foil plans to sabotage the treaty by Ludmilla Schindler and Ivan Gudonov of the Eastern bloc military.