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Housewife Isabel Glenning feels she is being neglected by her publisher husband Randolph. After dropping him off at work, Isabel finds a revealing sun suit in their car, which Randy had intended as a gift for his vacationing secretary, Linda Morris. When the jealous Isabel sees the beautiful young lady who is to be Linda's replacement, she insists on picking Randy's new secretary herself, and selects bumbling teenager Doris Mann. The love-struck Doris then begins to imagine a torrid affair between herself and Randy, and enters details of her fantasy tryst into her diary. That night at home, Doris is forced to run interference between her sister Pat, a self-absorbed model, and Pat's old boyfriend, press agent Tommy Burton, when Pat makes dates on the same night with both Tommy and Douglas Crane, an aging motion picture star. After Pat leaves with Douglas, Tommy chastises Doris for devoting herself to her sister, arguing that Doris deserves her own social life. Later, Isabel learns that Randy has agreed to back a new show starring his old girl friend, Diana Lee. Randy insists that he is investing in the show for business purposes only, but Diana, it turns out, has other plans. Isabel is soon distracted from Diana, however, when she finds Doris' diary among Randy's manuscripts. Soon, newspapers are filled with stories of the pending Glennings divorce, with Doris named as the co-respondent. Afraid of what Doris might say to reporters, Randy asks Diana to take care of the teenager until the trial begins, which the scheming actress readily agrees to do. During the divorce hearing, Randy's defense falls apart when Isabel's lawyer proves that some entries in the diary are true, and Doris, under Diana's tutelage, comes into the courtroom looking more the seductress than the innocent. Isabel is granted a divorce, but afterward, Randy forces her to go to a rehearsal, where Diana's plot to recapture Randy is exposed. After the Glennings reunite, Doris and Tommy discover their attraction for each other. The two are married, and on their wedding night, Tommy throws Doris' diary in the fireplace.