After they move to their new home, Tom starts working hard on his inventions and neglecting his wife Aileen. She grows bitter and tries to persuade him that she would much rather have less money and more of his society, but he cannot understand her viewpoint. One night Tom brings one of his chums, Bob Barrett, to supper, and Bob makes himself very agreeable to Aileen, who is considerably flattered by his attentions. O'Hara sees trouble ahead, but can do nothing to avert it. Tom gets a letter from Julius Blake, a promoter, asking him to call and explain his invention, and must break an engagement with Aileen to go there. When he finds that she is angry, he suggests that Bob Barrett take her to the theater in his place. After this, Tom becomes more and more engrossed in his work and Aileen greatly feels his neglect. Bob continually flatters the young woman and worms himself into her good graces, taking Tom's place whenever he wants to stay at home with his work, which frequently happens. One night O'Hara comes to the house to see his grandson and finds him alone, his mother having gone for a walk with Bob. He puts the little boy to bed and stays in his room with him until he falls asleep. While he is still there, Aileen and Bob return from their walk and enter the house. Bob commences to take her in his arms and kiss her, whispering to her that her husband no longer cares for her, and suggesting that she go away with him. She suddenly realizes the danger she is in and calls loudly for help. Her father hears her, comes downstairs, and angrily orders Bob from the house, forbidding him to enter its doors again. Then he comforts his daughter and makes her see how foolishly she has been acting. Tom comes in later, thoroughly disheartened. The promoter, Blake, has stolen all his ideas and refuses to recompense him in any way for them. Aileen comforts her husband in his sorrow, while O'Hara reminds them that they still have their home and their son and tells them not to worry over what might have been. Drawn together by their deeper knowledge of themselves, Tom and Aileen find that their true happiness lies in consideration for each other, and bless O'Hara for all he has done for them.