Maribel, a young typist, starts working at a construction company as the secretary for the director, Don Ignacio. To seduce the girl, the businessman gets a loan so her parents can buy a new home, thereby obtaining permission for Maribel to accompany him to London. Upon her return to Madrid, the two continue their relationship until Carlos, a young journalist Maribel meets while interviewing the director, appears. They go out together, and the young man falls in love with her. Meanwhile, Maribel has gradually become disillusioned with her boss and, unable to bear the double relationship, talks to both of them, ready for anything.