The story follows Sreeja, Nimisha Sajayan and Prasad, Fahadh Faasil, a newly married couple from Cherthala. They currently reside in Kasaragod due to Sreeja's family's opposition to their inter-caste marriage.
During a bus journey, Sreeja's gold nuptial chain gets snatched from behind by a thief. She looks back just in time to see him swallow the chain. She alerts the other passengers, who promptly beat up the suspect and hand him over to the nearby police station.
On police inquiry, the thief says that his name is also Prasad, but does not produce any ID and repeatedly denies having stolen the chain. The husband explains that they were planning to sell the chain to drill a borewell on their land, to harvest tobacco plants as a supporting business. The police officers privately contemplate dropping the case due to the thief's lack of ID, but decide against it, as the incident happened in public. ASI Chandran Alencier Ley Lopez asks Sreeja for her testimony, which he downplays sentence by sentence to show that the grounds are too weak to register a complaint. He suggests that they keep the thief at the station overnight till he passes the chain, and the couple agrees. While sending Sreeja on a bus back home, Prasad offends her by saying that she should have been more careful.
Prasad stays back at the police station to keep an eye on the thief. The thief, meanwhile, seems carefree, eating happily and enjoying the neighboring Temple Inauguration. The next morning, the police escort the thief to the toilet but don’t find any chain in his feces. An X-ray confirms the chain is in his stomach, prompting the police to register an FIR against the thief.
Meanwhile, ASI Chandran asks Sreeja and Prasad to twist the case in order to gain appreciation, which the thief realizes later. The next morning, escorted again to the toilet, the thief attempts an escape and leads the police on a chase through solar panel fields—only to be apprehended by Prasad. A struggle happens near a canal area and the thief is apprehended and brought back to the police station. At the police station, the thief claims that ASI Chandran had told him to run away by keeping the chain behind, at a bus stop. Unable to find the chain, the thief is scanned again, but this time there is no chain in his stomach. Realizing his job is in danger, Chandran replaces the original gold chain to settle the matter and asks Sreeja to play along in a bid to charge the thief.
The next day, as the ASI asked, Sreeja signs the document by falsely confessing that the chain was found by the police, which belongs to her. However, as the cops step outside the room, the thief convinces Sreeja and her husband that they should tell the court that the chain does not belong to them and tells them where he actually threw her gold chain (near the canal). Prasad is later shown finding the gold chain as he searches the canal area specified by the thief.
In the end, the thief who is shown to be free writes a thank you note to Sreeja presumably for telling the truth in the court which freed him. ASI Chandran is seen spending time with his grandchildren, suggesting that he took an early retirement. Sreeja and Prasad are shown to be happy after they found water from the borewell, ready to harvest tobacco plants.
