Ninja Empire (1990)

A modeling school has become the recruitment center for a prostitution ring led by local crime boss Tiger. When Pam, one of the former models turned prostitutes escapes and attempts to send evidence to some reliable friends, she is caught by Decker, a local hood who works for Teddy, an international ninja expert who has been leading the crime in the area with Tiger. However, Pam's sister Bonnie is already investigating the school while Bonnie's partner, Brad was preparing for vacation and decides to help instead.