Tower of Death

Martial arts expert Jim Koo dies suddenly during the funeral service, a helicopter with grappling hooks steals Koo's coffin. Lee Chun-Keung (Bruce Lee), Koo's best friend, hangs onto the helicopter and plunges to his death. Keung's brother, Chun-Kwok (Tang Lung) investigates and finds the Tower of Death which is located underground beneath a temple and which is indeed an underground drug manufacturing center. Chun-Kwok beats all people inside and finds Koo alive. Koo is the mastermind behind the drug manufacturing center. Chun-Kwok kills Koo and avenges his brother's death.