Abroad the No. 20 Madras Mail to try and meet Mammootty, Tony Kurushingal (Mohanlal), Hitchcock Kanjikuzhyi (Manian Pillai Raju) and Kumbalam Hari (Jagadish), consume alcohol, and Tony flirts with an attractive female passenger, Devi Nair (Suchitra). He wants to sit next to her, but the passenger occupying that seat, as well as her father, R.K. Nair, objects, leading to a physical altercation, which results in Tony being asked to return to his seat. After a scheduled stop, the train resumes, and Mr. Nair finds his daughter's dead body in the toilet. The Police are summoned, begin an investigation, and conclude that one of three people may have have responsible for this homicide, namely: The passenger seated next Devi - a male who is not who he claims to be; Tony; and a third unknown male/female suspect.