In San Francisco, Sylvia Douglas and her fiancé, James Callahan, who has recently turned back to his criminal ways, flee the city after Jim steals a diamond necklace due to frustration with his job search. Detective Graham pursues them to a remote island in the South Pacific, where they encounter a gangster named Murdock. Callahan becomes enamored with a local woman named Leona, while Sylvia seeks refuge with Graham from Murdock's advances. As tensions rise, a volcanic eruption adds further complications to their predicament.
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