Dan Holstein, 42, owns a successful “small home contracting business.” Married to a cold and distant wife, he has sex with convention girls (a type of call girl) when he goes out of town for conventions. At a convention in Cincinatti, he meets 22-year-old Judy, and they fall in love. Holstein convinces Judy to move to New York City to be his mistress until he can leave his wife for her. He will set her up in an apartment and give her money. She agrees.

Holstein visits Judy three days a week, and always leaves to spend the night at home. The rest of the time she is alone and bored, so she starts working as a convention girl again. Meanwhile, Holstein does not want to give his wife half of his business in a divorce, so he murders her instead, making it look like a suicide. However, when he finds out that Judy has been having sex with other men in New York City, he loses his temper.