FIR

Irfan Ahmed, an IIT Madras gold medalist, lives in Triplicane, Chennai with his mother Praveena Begum and his friends. He struggles at job interviews and supports himself by working part-time at a perfume factory. He dreams of turning his passion into a full-time perfume business headed by Perumal and his son Karthikeyan, traveling across the country to source chemicals.

On his way back from buying chemicals in Hyderabad, Irfan loses his cellphone, intensifying his worry about missing a flight to Chennai. In his frustration, he publicly threatens to bomb Hyderabad airport, triggering his arrest and a quick release. The incident unsettles him and foreshadows the danger surrounding his career path.

The threat reverberates through authorities, and Irfan is arrested but soon released. The case draws media attention and raises questions about his true intentions. He heads back to Chennai with a growing sense of being trapped in a larger conspiracy.

The next day, a bomb explodes at the same Hyderabad airport, killing many people. Irfan's phone is recovered at the blast site, thrusting him back into the investigative spotlight. He is arrested again and detained under orders from NIA advisor Ajay Dewan.

Irfan is interrogated by NIA officer Anisha Qureshi and a low-ranking police officer, accused of being Abu Bakkar Abdullah. The intense questioning, media sensationalism, and coercive tactics leave him traumatized. The investigation paints him as a dangerous terrorist while his true identity remains hidden.

Prathana Raman, a junior lawyer, volunteers to represent Irfan, offering a glimmer of legal hope. Praveena Begum visits him in custody, but the guards deny her access, deepening her humiliation. The public prosecution's assault on Praveena triggers a severe asthma attack, underscoring the personal toll of the case.

Irfan is granted to visit his mother in hospital under extreme surveillance, but he escapes custody and discovers that Praveena Begum has died. The loss devastates him and compounds the sense that he is caught in a larger scheme. He flees the hospital to avoid further capture.

Riyaz, Dr. Zazi's son, approaches Irfan and persuades him to help create sarin gas to execute a terrorist attack. He agrees and moves toward the clandestine setup to obtain the chemicals and the know-how. The plan marks Irfan's plunge into the world of weapons-grade chemicals.

Irfan and the team test the sarin gas on Dr. Zazi at the factory, revealing the horrifying scale of the operation. He is troubled by the moral implications and wonders if he can stop the plan. The stakes escalate as the weapon's potential consequences become clear.

Anisha reaches the factory and confronts Irfan and Riyaz, but Karthikeyan is revealed to be the real Abu Bakkar Abdullah after stabbing Anisha. The revelation reframes the entire hunt and widens the conspiracy behind the attack. Irfan grasps that he is now entangled in a deeper undercover operation.

As the bomb is activated, Abu Bakr orders the killing of Irfan, but Irfan overpowers and kills the henchman and reveals his true role as an undercover NIA agent who has waited years to expose Abu Bakr. Archana arrives as another undercover agent and eliminates Riyaz, while Irfan eliminates Abu Bakr. The police surround the factory with orders from Ajay Dewan.

With government approval, a drone missile destroys the factory, seemingly killing Irfan. It is revealed that Ajay Dewan orchestrated the entire operation, having created Irfan's alias Irfan Ahmed as part of the plan. Irfan's true identity is finally revealed as Faizal Ibrahim Raiz (FIR), suggesting he survives on another mission.