'Secret Love Story' is the story of Mitali or Love Pagli who throws stones at couples. The detective agency starts investigating the case and starts searching her. Mr. Sanyal hires Rik and Dimpy for this task. Dimpy finds the photo of Love Pagli in her father's personal diary. As she reads the diary she finds out that her father though a married man had fallen in love with Mitali. Mitali selflessly loved him and didn't wish to ruin his married life. Yet Ronojoy's wife was disturbed by their relation and died in an accident. Mitali became mad. Further investigations help them nab criminals involved in kidney transplant racket who were using Mitali as their bait to catch the victims. Ronojoy takes Mitali home and she recovers and gets back to normal life.