Mynderse Van Dyun, a wealthy old New York aristocrat, has one goal in life, to see his granddaughter Catherine and grandson Pell married; for, although they are cousins, the marriage would perpetuate the family name. Catherine, however, is in love with Paul La Farge and detests her drug-addicted cousin, who seduces and then secretly marries her maid, Nora Duffy. After a son is born to Nora, who dies in childbirth, the infant is taken to the Van Dyun house where, only a few days before, Pell, in a dispute involving drugs, had been thrown from a window by his valet and killed. When the old man refuses to acknowledge the child, Catherine and Paul adopt the baby, leave the Van Dyun house and are married. Five years later, Catherine comes to visit the old man with his great-grandson, and, seeing what a fine boy he is, the old aristocrat is forced to admit that the boy is worthy of bearing his name.