Sam Moran (Richard Boone) is a Honolulu charter-boat captain who leads fishing expeditions in the tropical paradise. When his daughter is found murdered at the party of a wealthy young playboy, he seeks the truth about the murder. Convinced the playboy is guilty, he enlists the help of his friend Kittibelle (Joan Blondell), who runs an alcohol-abuse treatment center where Sam's former love Melissa (Vera Miles) is a recovering alcoholic.