The Chief labour officer of a private steel company in Barrackpur senses corruption in the management. An idealist he resigns and is murdered. The secretary of the trade union, Probir gets to know of it and is murdered. His comrade Bijan manages to escape and absconds. Nirupama, the sister, who silently cherishes Bijan, along with Sandipan, a reporter, tracks down the hired gang of killers, which include Sital, the goal keeper in a smalltime football team. Sital reveals that they had been lured with the promise of a job. But the promises were not kept and sital wishes to disown his past.Meanwhile, Bijan has made good as a salesman in Nasik and returns to Calcutta as a changed man. His values had been eroded by time and success. He tries to justify his desertion of his earlier convictions, but fails to convince Nirupama. He wants a settled married life with Nirupama. She still clings to the ideals of her dead brother. But confusion and desperation forces Nirupama to accept his proposal. On the date of marriage, Sandipan is found dead in mysterious circumstances. Confused, Nirupama wants to postpone the marriage. Quarrels follow and Nirupama realises that the void between them is too wide to be bridged. The rift, however, forces a helpless girl to the threshold of self awareness. She realises that she, The film ends with Niupama beginning the struggle all by herself.