Watch the full movie, No.20 Madras Mail online, only on Eros Now. "The train No.20 Madras Mail to Madras starts from Trivandrum Central. R.K. Nair (M.G. Soman), a Kollam-based businessman takes the first class coupe of the train to Madras with his wife Geetha (Jayabharathi) and daughter Devi (Suchitra) from Kollam Junction. Tony Kurushingan (Mohanlal), along with his friends Hitchcock Kanjikuzhi (Manianpilla Raju) and Kumbalam Hari (Jagadish) boards the same coach from Kottayam. Tony is the son of a wealthy businessman, Kurishinkal Kariyachan (Jagannatha Varma), Kanjikuzhi is a detective novelist and Hari is a young politician. The three of them are going to Madras for seeing a cricket test match and to make attempts to make Kanjikuzhi's novel Vaazhikuzhiyile Kolapathakam a movie. All the three are heavily drunken while boarding the train. After entering the train and seeing Devi, Tony and friends make several attempts in getting a seat for Tony in the same coupe of Devi, with the help of TTE officer Nadar (Innocent) but with little success. While doing so Tony gets into heated arguments with RK Nair and Sunil (Ashokan), who has a reserved seat in the same coupe (from Ernakulam) as that of R.K. Nair. Actor Mammootty boards the train from Thrissur and gets into the same coach. Nadar leaves the train at Palakkad after giving company with Tony and gang and the new TTE Chokalingam a.k.a. Choki (Jagathy Sreekumar) enters the train. Tony and his friends visit Mammootty in his coupe and soon become friends with him. Meanwhile, Tony tries to flirt with Devi while she returns from the toilet, which causes Tony to land in trouble with R.K Nair but on Mammootty's intervention the matter is settled.In the morning, as the train reaches Madras, Devi is found murdered in the toilet. Suspicion lands on Tony and friends and they run away from the spot in fear. The investigation is carried out by the Police led by DySP Murthy (V.K.Sriraman) who comes to know via TTE Chokalingam th