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Although Spencer Wellington (Howard Hickman) comes from an old, aristocratic family, he carries a bad gene. His doctor, John Rand (George Fisher) recommends that he never marry, but Wellington ignores his advice and weds Grace Valiant (Mary Mersch), who the doctor himself loves. Grace checks out Wellington's family tree and discovers the gene, but she's already pregnant. She gives birth to a child with a birth defect that kills him. A healthy, orphaned infant is substituted without her knowledge, but she goes insane anyhow and believes the child must be destroyed. While she is confined in her own home, Wellington immerses himself in rounds of orgies. After five years, Grace regains her sanity and Wellington dies from his revelries, leaving the way open for her to unite with the doctor.