A martial-arts student learns the iron fist and death grip techniques to avenge his teacher's death.

This film is set during the Japanese occupation of China circa WWII. In it, the Japanese occupiers (and the Chinese Quislings who work for them) are portrayed as total monsters who kill children and rape all women. The heroes are resistance fighters who oppose the occupation.

Kon Loong, a rickshaw boy, learns kung-fu from master Auyang Tin-Kin, for three years of practice. Kon Loong is recognized as the best among all the students. One day, when the master is out for a journey, another fighting association sends a challenge to the school, and Kon Loong accepts it. He goes with four other brothers, but they are badly defeated by their opponents, who hired the help of a Japanese karate fighter. When the master returns, he will have to save the school's honour, in a duel against the two other schools.

Blackie Ko is framed for murder and rape by a corrupt mayor who wants to protect his wayward son, who was the real culprit of the crime. Enter undercover cop Tong Lung, who discovers the truth about the frame up. He, then frees Blackie and together they wage war on the mayor and his army of fighters.

Hong Kong thriller.