The narrative opens in a remote and desolate desert region, where a secretive and shady transaction takes place between two mysterious individuals, setting an ominous tone for the events to follow. The scene then abruptly shifts to the bustling city of Dhaka, where a terrifying crime occurs under the cover of darkness. A group of heavily armed hooligans launches a violent assault on a chemical factory, ruthlessly murdering the security guards on duty to steal a supply of highly dangerous chemicals. This brazen heist puts the local police force on high alert, as the potential for misuse of these substances is immense.
By the following day, the stolen chemicals are weaponized to create an incredibly powerful explosive device. In a heartbreaking act of terror, the bomb is detonated directly in front of a school just moments before a school bus arrives, resulting in the tragic deaths of many small children. This senseless act of violence plunges the entire city of Dhaka into a state of absolute panic and mourning.
As the investigation unfolds, the police make a chilling discovery: the original criminals who raided the chemical factory have themselves been murdered. The new killer has left behind a disturbing and cryptic signature—a smiley face drawn directly onto the dead bodies. This gruesome detail quickly becomes a media sensation, with every major newspaper running the headline "Smiley on the Corpse's Body," further spreading fear and paranoia throughout the population.
In response to the escalating crisis, the government deploys the Bomb Disposal Unit and the SWAT Bangladesh team. However, the mastermind behind the chaos is far from a typical criminal; he is a strategist who begins playing a psychological game with the authorities. He floods the police emergency helplines with hundreds of fake bomb threats, deliberately misguiding the officers and forcing them to waste precious time and resources racing to false locations.
During the investigation, the police manage to trace a vehicle that was utilized during the school bombing. A high-stakes chase leads them to the car thief, which eventually reveals a larger hideout containing critical clues. It becomes evident that they are not dealing with a standard terrorist, but rather a psychopath who views the city as his personal playground.
Through an international collaboration with the Malaysian police, the authorities finally uncover the identity of the antagonist: Jisan, also known as Azimul Karim Jisan. Jisan is described as a drug-addicted psycho killer and a prominent figure in the Malaysian underground. After a previous violent encounter with Malaysian law enforcement, he escaped and fled to Bangladesh. His goal was to reunite with his uncle, Sajedul Karim, and establish a new criminal empire to dominate the international mafia.
Throughout the chaos, a determined crime journalist, Chaity, closely monitors the police movements. Utilizing her own extensive network and insider information regarding the criminal underworld, she provides the police with vital intelligence that aids their pursuit. As the pieces of the puzzle fall into place, the authorities realize that Jisan's actions are not merely the whims of a madman, but are part of a sinister geopolitical plot. Certain foreign intelligence agencies are working behind the scenes to destabilize Bangladesh and dismantle its national defense layers.
The climax reaches a fever pitch as the Bomb Disposal Unit, the Detective Branch (DB), and SWAT Bangladesh launch a coordinated final operation. They track down and raid the secret den of Jisan within the city of Dhaka. In a tense environment filled with live explosives, the teams work frantically to defuse the bombs. The operation culminates in a massive, violent shootout, where the forces of law and order finally manage to bring down the man responsible for the devastating Dhaka Attack.
