Catherine Ling was abandoned in the streets of Hong Kong at the age of four, and was schooled in the art of survival. As a teenager, she came under the tutelage of the mysterious Hu Chang - a skilled assassin and master poisoner. As a young woman, she was recruited by the CIA and is now one of their most effective operatives. Then her old friend Hu Chang creates something deadly and completely untraceable - and the chase is on to be the first to get it.