A famous star of Bengali films, Arindam Mukherjee (Uttam Kumar), has been invited to the capital to receive a prestigious award. As all the flights are booked, he is forced to travel by a train from Calcutta to New Delhi. He is in a foul mood as the morning's papers are filled with his being involved in an altercation and his latest film is slated to become his first flop.In the restaurant car, he meets Aditi Sengupta (Sharmila Tagore), a young journalist who edits a modern women's magazine, Adhunika.[2] Filled with contempt for the likes of him, she secretly plans to interview him because she thinks it would make a saleable 'copy'. It soon leads to him unwittingly pouring out his life history. The interaction also brings to surface the inner insecurities of Arindam's character and his consciousness of the limitations of his 'powers'. Aditi initially takes notes, surreptitiously, but later on, out of empathy almost bordering on pity, abandons it. However, critical of the star, she interrogates him and the star ends up re-examining his life. In a series of conversations with Aditi, he also reveals his past and guilt.
Arindam talks about Shankar-da, his mentor, taking us back to his early youth. His selling out to films and giving up theatre against the wishes of his old teacher... His first day's shoot, and he being snubbed by the successful actor Mukunda Lahiri... A few years later Mukunda Lahiri, now a forgotten actor after a series of flops, comes to him to beg for a small part. He rejects the ageing actor in revenge. His taking refuge in alcohol. And his refusing to help a friend in politics.
Toward the end of the train journey, Arindam is drunk and feels a need to confide his wrongdoings. He asks the conductor to fetch Aditi. He begins to confess an affair with a married woman. But Aditi stops him. It was an affair with Promila, which ended in a brawl with her husband. He even contemplates suicide, but Aditi sends him to his cubicle before he can do anything about his plan.
As the star re-lives and examines his life with Aditi, a bond develops between them. Aditi realises that in spite of his fame and success, Arindam is a lonely man, and needs her sympathy and understanding. Out of respect for his frank confession, she chooses to suppress the story and tears up the notes she has written. She lets the hero preserve his public image.