Saraswathi (K. R. Vijaya), an inmate of an orphanage who believes in the ideals of a political party that fights for the rights of the working class is married to Mathew, an estate owner.
A young graduate, Sankarankutty (Madhu) is appointed by Saraswathi Mathew as the Manager of the estate following the death of her husband.
The past life of the important characters is narrated by powerful dialogues, rather than in usual visual "flashbacks" .
The local police was twisting the murder case in favour of real culprits, the estate owners Ramunni Menon (Veeran), John Sebastian ( Paravoor Bharathan ) and their group who murdered Mathew by mixing poison in the coffee served to him through Mathew's servant Pankiyamma (T. R. Omana).
Sankarankutty's lover Gomathi (Jayabharathi) and Yesudas are children of the party worker Achuthan Nair (Sankaradi) who were brought up in their childhood by Saraswathi when they were admitted to the orphanage following the death of their mother.