The story begins in a prison located in one of the northern cities of Iran. Some prisoners of evil reputation for causing confusion in the prison, are sent to an area of a bad climate. Due to slippery roads, the bus carrying them overturns. In this incident, some of the prisoners are killed, and some are injured… Some also manage to escape; among them there exists a political prisoner. Thereby, the Security Organization orders a major to call the police helicopters and dogs, and pursue the prisoners.