One day Sabri, an ordinary man working in a government office commits a crime. There is no conspicuous motivation for the murder. "Actually I killed a rat" he says to the writer Nuri, who visits him in prison. The next morning Sabri commits suicide. The writer starts a series of conversations with the people who were close to him to learn the secret behind his words. And by this the details of Sabri's life reveals. Details which only the writer Nuri knows.