Mongolia during World War II. China is occupied by the Japanese. In the Japanese-occupied Mongolian city of Kaal, a poison gas factory is to be built, its products intended for use against the Chinese. The Chinese resistance sends spies into the city to thwart these plans, including the formidable Fok Ming-Ming and her equally skilled colleague Sky No. 1. But the tyrannical General Toga, who is holding the governor prisoner, sets a treacherous trap for the two...