After their wedding, Richard Vaughan and his wife Courtney take up residence in Richard's ancestral home. Courtney, despised by Nanny, the old housekeeper, and neglected by her husband, who buries himself in his chemical experiments, leads a lonely life. Consequently, when experimental chemist Basil Gallatin pays a lengthy visit to the Vaughan home, Courtney finds herself attracted to him. One day, during Richard's absence, a burglar alarm places Courtney and Gallatin in a compromising situation. Witnessing their embrace, Nanny is struck speechless, but when Richard returns she recovers her speech and gives damning evidence against Courtney. Gallatin flees, and Richard, realizing his culpability, gives his wife a divorce. Having read of the divorce, Gallatin returns and Courtney admonishes Richard to kill them both. Richard frightens Gallatin away with the threat of exploding one of his compounds, but Courtney defies death and remains.