Betty is arrested on murder charges, while her lover Jacob Varghese is on the run. Jacob tactfully misleads the police and flees with Betty, and the pair stay hidden for several days as they try to stay one step ahead. On their way to collect passports, Betty becomes involved in a protest and is admitted to the hospital, while Jacob is arrested. In the police station, Jacob is ruthlessly handled by officers, and the inmates he encounters come across as arrogant and unsympathetic, pushing him toward an escape. He shares his plan with another inmate named Simon, who initially disagreed but later agrees because he wants to reconnect with his family.
Past: Jacob was the manager of Appachan's company, and Charlie was Appachan's driver. Charlie was keen to take revenge on Appachan after he killed his father. During this period, Jacob met and fell in love with Betty. Meanwhile, SI James had kidnapped and killed a girl named Indu, and Betty became the sole witness and testified to James' involvement in Indu's death. James is released on bail and tortures Betty, but Jacob kills him in anger. Jacob tells everything to Charlie, who robs 35 million from Appachan's company. Charlie goes to Australia and promises to return to take him and Betty. Betty ends up in a convent from where she is arrested.
Present: Simon and Jacob plan to escape and somehow manage to get the other inmates to leave their cell. Meanwhile, a thief named Devassy and a migrant worker Ramu arrive, and they also plan to escape with Simon and Jacob. However, the police find marijuana in Simon's cell. Jacob digs a hole through the toilet of his cell into the drainage and starts building the tunnel bit by bit with the help of Devassy, Ramu, and two other thieves who are twins and initially hated the escape plan but later joined after learning they had been falsely accused. A new inmate arrives on a molestation charge, and Jacob and his group somehow evade him. With whom Jacob had a fight earlier, Udayan arrives at their cell to foil their plan.
Appachan sends goons to brutally torture Jacob to coax a confession about Charlie's location and then kill him. The gang includes Simon, who helps Jacob and his crew. Jacob uses blackmail to force Udayan to stay silent so that he can also escape. During the night, Jacob, Simon, Devassy, Udayan, Ramu, and the twin brothers begin their escape through the tunnel. In the tunnel, Jacob and Udayan clash; Jacob emerges victorious and escapes. The police are alerted, and Udayan is caught and brutalized. They start chasing the other escapees. All manage to jump into a river, except the twins, one of whom is struck by a police jeep. Later, Jacob helps Betty escape from the hospital. Devassy and Ramu are set to reach West Bengal in 2–3 days. Simon and his gang escape in a boat and also arrange bail for the twins. They head toward Australia, where Charlie is settled.
