Ninja: Silent Assassin (1987)

When police officer Alvin loses both his star witness and his wife to drug kingpin (and ninja assassin) Rudolph, he vows to get revenge. Travelling to Hong Kong, hot on Rudolph's trail, he teams up with local investigators Gordon, Vivian and Jackie. Meanwhile, a young street punk named Edmund is hunting for the man who killed his father. Could they all possibly be searching for the same person?