South Pacific survivor

An assassin decapitates a U.S. congressman in American Samoa then enters independent Samoa for other targets. Polynesian beauty Pua, the sole agent of the Samoan Secret Service, must protect their national leader--her grandfather. With an anti-colonial chip on her shoulder and a black belt to back it up, she faces Ken, a down-on-his-luck CIA agent. They close in on each other and the warrior-assassin as they race to discover Robert Louis Stevenson's secret. It leads to evidence that could re-ignite civil war, which a shadowy chief tries to do.