Kalu and Tuila are two South Pacific islanders who are getting married. Invited to their wedding are several tourists who have recently arrived aboard a yacht. During the wedding Kalu sings a "Forbidden Melody", which is a song that a young man sings only once in his life, on the day of his wedding. However, he is enticed by Peggy, a nightclub performer who arrived on the yacht, into an illicit affair, eventually leaving with the tourists when their yacht departs. One of the other tourists is a nightclub owner, who offers Kalu a job back in the states.

A dangerous amnesiac escapes from an asylum, hides in the opera house, and is suspected of getting revenge on those who tried to murder him 13 years ago.

When a teenager's father is accused of murder, the boy and his high-school classmates set out to find the real killer.