The time is 1939. War is raging in Europe. The key to its outcome lies in the secret formula to the atomic bomb held by a Jewish Scientist.Private Eye Yoyo has been entrusted to assist the scientist in passing the secret to the Americans. The place of exchange: Hong Kong. The secret formula falls into the hands of the Head of the Hong Kong police who intends to sell it to the Japanese. Yoyo enlists the help of his pal Inspector Robin. Amidst clumsy Gestapo's, the treacherous Head of police and Japanese spies, a mysterious lady in black gets away with the formula.Yoyo and Robin finally complete their mission and reverse the fate of the world.