Irresponsible Billy Thorpe is sent to South America by his fiancée Claire's father, "rubber king" George Vincent, to reform. Upon arriving, Billy goes to work for the plantation foreman, Vincent's son-in-law James Ellison, who is having an affair with native girl Koree. When the Vincent yacht unexpectedly arrives, bringing Vincent, Claire, and Ellison's wife Mary, Billy induces Ellison to behave respectably, and the two go on board. That evening, Koree swims to the yacht, and Ellison allows the party to suspect that she is Billy's sweetheart. Billy keeps silent for Mary's sake, but after a fight with Santos Cordero, Koree's former lover, he becomes so disgusted with Ellison's treachery and the others' suspicions that he swims ashore, wounded, and is nursed by Koree. Claire follows and, after learning the truth from Koree, is reconciled with Billy while Ellison is sent home to rehabilitate himself.