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Black Paradise begins as lifelong crook Jack Callahan (Leslie Fenton) promises that he'll reform for the sake of his sweetheart Sylvia Douglas (Madge Bellamy). But he can't, and when detective Lawrence Graham (Edmund Lowe) comes calling, Jack takes Sylvia by the hand and escapes to the safety of the schooner owned by criminal chieftain Murdock (Ed Peil Sr.), moored 12 miles outside of San Francisco. Graham boards the schooner, only to be caught by Murdock and forced to work as a crewman. The vessel ends up in the South Seas, where Jack takes up with a local native girl; meanwhile, Sylvia falls in love with the captive Graham. Murdock orders Sylvia to "give in" to him, threatening to kill Graham if she doesn't. Only the timely eruption of a volcano saves Sylvia from sacrificing her virtue to save the man she loves.