Sam Harris, a black worker on the sugar plantation of Hugh Houston in Puerto Rico, is crippled for life when Houston beats him. Huston silences Harris with money and promises him a monthly allotment for the rest of his life. Houston's secretary, Franklin Harvey, is puzzled by Harris' regular appearances at Houston's office. When Houston's daughter Sybil, who lives in Boston, visits her father, she so enchants Harvey that he becomes fiercely determined to marry her. Sybil repulses Franklin's attentions, and after her father dies, Franklin tries to prevent her marriage to the man she loves, John Carter, by falsifying Houston's marriage certificate, substituting the name of Harris' mother for that of Sybil's own. When he threatens to reveal to John that Sybil is part black, she orders him to leave but is later haunted by the fear that her child will be born black.