An army captain is on a mission to track down and destroy a terrorist gang and deactivate the sleeper cells under its command.

A tabloid writer has evidence of the assassination of a US Senator. A visit from a scrupulous FBI agent suggests he may know more than he's admitting about the assassination and the key may reside in the recesses of the writer's dark past.

Anwar Ahmed Zayed is a Pakistani sleeper cell activist, who tried to inflict terror using a series of bombings in five different places of Kolkata. However, his plans are about to be derailed as Imtiyaz Kabir, the SP of Anti Terrorist Squad, headed by ADG Vikram Dwivedi and Monali Bhattacharyya, a cryptologist from IB team join hands to decipher the code language used by IM in email communications. Imtiyaz and his team, with the supervision of Vikram Dwivedi, raids the hide-outs of the terrorists and nab all the seven terrorists involved in this attack including Zayed. While behind the bars, Zayed apparently transforms himself into a pious Muslim. He wants to live the life of a common man and writes to the Chief Minister to review his death sentence and give him another chance to lead a normal life. Zayed gets released from jail after four years of his arrest and goes back to his village to reunite with his wife Sabina and daughter Razia.