The police discover a stranger in a cell closed for 50 years. The life of Jailer Mostak Ahmed, under various pressures from his family and superiors, becomes more miserable.
The prison authorities fail to understand how the stranger entered the cell. In addition, everyone begins to fear him, and various speculations are born out of this ambiguity.
The jail authority secretly brings in a sign language interpreter to communicate with the stranger. The stranger claims that he has been in prison for 250 years.
The inmates begin to address the stranger as 'Gazi Peer'. Gazi Baba pronounces people guilty or innocent just by looking at their eyes. Meanwhile, it is revealed that Gazi Baba has come from a secret prison in Andaman.
Raju, a prisoner who got caught thanks to the powers of Gazi Baba, is extremely angry with him. On the other hand, Mostak and the Deputy Jailer count hours till night when they will finally find answers to their questions.
While searching for her father, Maha learns Mystery Man's true identity. On the other hand, Raju and Mystery Man discuss that they don't have much time as there will be a prison shift.
The pragmatic Aslam is on to Gazi Baba, and the latter's followers are on to Aslam. While Maha falls into a deep conflict, Gulzar doesn't believe the sneaky Raju.
Ashfaq questions Maha's closeness with Mystery Man. Gulzar and David have a face-off. When everything seems to be under control, the message to abort the mission arrives.
The Secret Group keeps its promise. Maha finds her father, and Mostak finds Ataur. But will Mystery Man follow the instructions given by the Secret Group?
Even though the Secret Group has aborted the mission, the mission continues inside the prison. According to Plan B, Raju instigates Murad and Gazi Baba's followers. Now everyone waits for the final bell.