An American woman ventures to Hong Kong, determined to uncover the fate of her missing husband, a photographer. Frustrated by a lack of progress with local authorities, she turns to an array of underground figures. These contacts introduce her to a rugged American mercenary engaged in operations against the Communists. He offers his assistance in her quest, setting the stage for a perilous journey filled with intrigue and danger as they navigate the shadows of the city in search of her lost loved one.