In Goa, 6 dead bodies are washed ashore where the police department deduce that Jothi, a drug lord is responsible for the mess. The police is unable to capture him for nearly a decade because not a single person has seen him in person as he is constantly on the move and has no permanent aides or accomplices.

Chitti is in charge for the drug trafficking in and around Goa. One day, he receives a call from Jothi about a missing drug consignment. Chitti and his men are unable to hunt down the culprit where it is revealed that Shiva is the mastermind behind the drug theft and is working for Chitti as his most trusted henchman. Chitti, along with Shiva and his nephew Guru, runs a crime syndicate in Goa.

In a turn of events, Shiva is actually Arul, an undercover officer who is assigned to expose Jothi and his entire drug cartel. He receives instructions from his higher officers Bharathi and Benjamin Vas and informs them about the activities of his gang from time to time. Arul is into this mission, along with his best friend and colleague Karthik, who also takes a stage name as Malik and works for Sharma, another drug lord from Mumbai, who is in possession of 1000 kg of pure heroin and is looking for a buyer.

The plan of Bharathi, Benjamin, and their team is to make Sharma and Jothi meet each other for the transaction of the 1000 kg of heroin and arrest them. Arul informs Bharathi that Sharma and Jothi are planning for a trial with just 100 kg of heroin, and if all goes well, they will deal with the remaining 900 kg. Bharathi and her team wisely plan to capture the huge bulk of 900 kg of drugs, along with Sharma and Jothi, so they have to leave the first trial transaction unmonitored. However, all plans go awry when Bharathi's jealous boss does not agree to her plan and conducts a raid for the trial transaction in the last moment.

The raid exposes Karthik's identity, who is taken to Chitti's place and gets tortured by Guru and his gang to reveal the identity of any other man working with him. Unable to bear the pain, Karthik reveals Arul's identity. Guru informs Chitti about Arul's true identity. When they attempt to kill him, Arul guns down Chitti and starts eliminating all the gang members, including Guru. Soon, Arul finds Karthik, but within moments, Karthik dies. Jothi is now aware of the death of Chitti and his entire crew and uses his influence to the cops to bring Arul into his custody.

The police force and Jothi's men join hands and hunt for Arul. Arul, all alone on this mission, still continues his own plan to expose Jothi and gets himself captured on purpose. Now that he has nothing to lose, he plans to play a final game of chance to meet Jothi face to face, earn his trust, and join as henchman again. Arul is the only survivor of the shootout at Chitti's place, and so only his account to Jothi will earn his trust.

Arul is brought to Jothi and is also able to cleverly convince him, but only up to an extent. He tells Jothi that his former partner-turned-archenemy Rane is responsible for the drug theft and shootout at Chitti's place. Jothi had been thinking Rane was dead, but Rane is actually alive and is plotting his vengeance. Jothi is still skeptical, so Arul is given 2 days to prove that Rane is alive and has done all these things. Arul succeeds by getting help from a prostitute whom he helped earlier.

Arul places all the stolen drugs at Rane's house and leads Jothi's men there, and they find the lost drugs. Jothi asks his men to kill Rane and his gang. Shiva cleverly does certain manipulations, kills Rane and his men, and places his own guns in Rane's hands. This leads Jothi and his men to believe that Rane's gun and the one used in the shootout at Chitti's place are the same. The gun is also sent for ballistic testing to check on Arul's story, and they all believe Arul's story is true.

Jothi asks Arul to join his gang and meet him at a secluded place. When Arul waits for the opportunity to gun down Jothi, he gets beaten up by his men. It is then revealed that his neighbor Usha, who was in love with Arul, had been secretly recording videos of him for her to admire, but her phone falls into the hands of Jothi's men. They find whom Arul has been meeting and dealing with so far and come to know he is also an undercover cop. As a result, Bharathi and Benjamin are assassinated by Jothi's men.

Jothi and his men beat Arul savagely, keep him bound in a harbor, and ask him the whereabouts of Sharma's remaining 900 kg of heroin. Arul whispers the location, and as Jothi comes closer to hear him, Arul spits blood onto his eyes. When all of Jothi's men are distracted, Arul escapes from his captors and kills them, leaving Jothi alone, and arrests him. Since nobody alive has seen Jothi in person, his arrest is unavoidable, and no political influence will work out. Arul rejects Usha's proposal and asks her to focus on her life. He then moves on to his next mission and kills Sharma and seizes the remaining 900 kg of heroin.