Haunted by the murder of her husband on their wedding day, champion kickboxer Kathy descends into a self-destructive spiral until she decides to seek justice against Ludwig, the ruthless crime lord responsible. After a failed infiltration leaves her near death, she is rescued and rehabilitated by a reclusive old man and his grandson. But her return to the city takes a deadly turn when Ludwig kidnaps her saviors, forcing Kathy to enter a brutal martial arts tournament where she must fight to save them and finally exact her revenge.