Marco

Victor, a blind person, witnesses the murder of his close friend Wasim. Despite his blindness, Victor identifies the killer by recognising the distinct scent of the killer's perfume and the killer's vehicle, a Land Rover Defender. Victor's identification leads the cops to suspect that the killer is Russell, who conspired with Wasim's elder brother Tariq, to carry out the murder. Tragically, Victor gets captured by Russell, who throws him into a tub of hydrofluoric acid, resulting in his death. Victor's brother George Peter, the patriarch of the Adattu family, one of the prominent crime families in Kochi, is devastated by the loss. Marco Jr, Peter's adopted brother who had been sent to Italy for safety, returns to India after learning about Victor's death. At Victor's memorial service at their local church, Marco vows to avenge Victor's death, declaring his intent to eliminate everyone involved in the heinous act, including Russell, who is present at the scene. Despite Peter's attempts to dissuade him from taking a path of violence, Marco remains resolute.
Meanwhile, Tony Issac, Russell's father and the leader of the Isaac family, a gold smuggling syndicate, manipulates the situation to his advantage and strikes a deal with Peter involving gold biscuits and a ransom, all while plotting further treachery. During Peter's return from the deal, Tony's secretary Devraj ambushes him in his car, revealing the conspiracy and fatally stabbing him. Peter survives, but is hospitalised, further enraging Marco. Peter informs Marco that Tony and Russell were responsible for Victor's death. As Marco sets out for vengeance, Russell reveals his true nature by thrashing and severely injuring Marco and using a chainsaw to sever the left arm of Marco's right-hand man Anwar. An enraged Marco retaliates, bitting off Russell's deputy Jahangir's ear, killing Russell's goons and severely injuring them with the same chainsaw. While preparing to kill Russell, Marco learns that Victor's pregnant wife Isha, is being held captive by Tony. In exchange for her release, Tony demands the Adattu family's entire gold business operations to be transferred in his name.
Marco captures and tortures Dev using phosgene gas. He confesses that Isha is at Tony's guesthouse before dying in an explosion. Marco storms the guesthouse, slaughtering Tony's henchmen brutally to rescue Isha. However, Tony deceives Marco, revealing that Isha is locked in the trunk of Russell's car. Marco and Anwar track Tony down to his farmhouse, where Tony reveals that he is bisexual and attempts to seduce them but Marco cuts off Tony's right hand using a katana and sends it to Russell, disguised as a suitcase containing company documents. In an act of revenge, Marco puts Tony in a trap with acid, a gun and a bomb. Russell and his men manage to save Tony from the acid and the gun, but do not notice the bomb. One of Russell's men slides the front gate open, which triggers the bomb. Russell and his men rush out of the warehouse and watch helplessly, as tony blasts into pieces. Meanwhile, Peter kills Tariq by hanging him.
Desperate for revenge, Russell seeks help from his elder brother, Cyrus, who is a ruthless and psychotic butcher. They launch an attack on the Adattu mansion during Isha's labour, cut the power and begin to brutally slaughter the entire family. Despite Peter and Marco's valiant efforts, Cyrus and Russell kill all the members of the family, including the children, Anwar and Marco's wife Maria. Cyrus mercilessly cuts open Isha's stomach and extracts her newborn child before killing her and leaves with her newborn child while severely injuring Marco, Peter and mutilating Peter's wife. Gravely injured, Marco and Peter are left to mourn their family's deaths. Peter urges Marco to avenge not only Victor, but the entire family. Marco adopts a striking and fearsome appearance, wearing a suit and a special perfume which his brother had made for him and confronts Cyrus and Russell at their factory. Marco fights through their henchmen in a bloody showdown, where he kills Russell by ripping his rib cage using a crowbar and takes out his heart with his bare hand. In a climatic encounter with Cyrus, who holds the newborn child over a pool of acid, Marco decapitates him and rescues the child before pushing him into the acid. Marco completes his path of vengeance and leaves the factory with the child, while paying the ultimate price in the suffering and loss of his family.
In a post-credit scene, which takes place some time after the film's events, Marco spends time with Victor's child in a beach until a platoon of cars arrive and suddenly take the child away.