On an ocean voyage, a librarian falls for a married man. After librarian Lulu Smith is accused by her patrons of having Spring fever, she spends her life savings on a cruise to Havana, during which she begins a romance with Bob Grover, a lawyer with political ambitions. After their return, Lulu becomes a clerical assistant for a newspaper, where she is pursued by brash reporter Al Holland. One night, several months into their affair, Bob comes to Lulu's apartment for dinner, bringing two Halloween masks with which they have a marvelous time playing. Their merriment is interrupted by a call from Al, whose proposal to Lulu prompts Bob to confess that he has an invalid wife whom he cannot leave. Lulu protests that she wishes to continue their affair, but Bob refuses to let her waste her life on him. They squabble, and Lulu throws him out without telling him she is pregnant. Time passes and Bob becomes district attorney, while Al becomes city editor of the newspaper. After Bob hires a detective, Marty, to find Lulu, the couple are reunited and Lulu introduces Bob to his daughter Roberta. Later, Lulu and Roberta are waiting to meet Bob, when Al suddenly appears. He is questioning he