Nahid suffers from double personality disorder. In the day she lives with her personality, and at night she is the playful girl Mervat. A psychiatrist treats her and discovers that her illness is the result of a psychological complex since childhood.
Nahed suffers from a split personality as during the day she maintains her usual character but at night she transforms into Mervat, a notorious flirt. She is treated by a psychiatrist who learns that her illness is due to a complex rooted in her childhood. Whilst a child her father had uncovered that her mother was not faithful whereby he begins treating her mother harshly and avoids her thus leaving her emotionally deprived. This somehow seeps through to Nahed’s subconscious. Nahed is eventually cured and she manages to get past her alter personality Mervat.