Martial arts classic starring Bruce Lee as Cheng Chao-on, an immigrant worker who takes a job with his cousins in an ice factory and discovers all manner of suspicious goings-on. Cheng might have promised his mother not to fight again but when he begins to investigate a series of disappearances - the latest of which has seen his own cousin go missing - he can't help but display his formidable martial arts skills. Taking on one opponent after another, Cheng will not stop until he has fought his way to the truth and the inevitable confrontation with the man known only as 'The Big Boss'.