Undefeatable

Kristi Jones (Cynthia Rothrock), a member of a local street gang who waits tables to send her younger sister, Karen, to med school. When funds are short, she returns to what she knows best-street fighting. But when Karen is suddenly found murdered, Kristi is determined to avenge her death, venturing into seedy corners of the city to bring the deranged killer to justice. (official distributor synopsis)