| Director | Arivazhagan Venkatachalam |
|---|
A woman named Jessica arrives at St. Thomas Church in Villivakkam, on the outskirts of Chennai, where she confesses her sins to a priest. The priest is murdered, while Jessica is abducted.
In Chennai, ACP Vetrimaaran IPS is celebrating the wedding anniversary of his elder brother, Aravind, and sister-in-law, Abhinaya. Everyone in the family is happy except for Vetri's mother, who berates Abhinaya for not having borne her a grandchild despite many years of marriage. However, after undergoing treatment by a famous fertility specialist, Dr. Tulsi, Abhinaya finally becomes pregnant. While the rest of his family is in a celebratory mood, Vetri notices that Abhinaya is moody most of the time.
Meanwhile, Vetri is put in charge of Jessica's abduction case and is assisted by Sub-Inspector Thirupathi. He suspects that there is a connection between the priest's murder and Jessica's disappearance. Vetri and Thirupathi visit Thendral, a teacher at the local preschool who was the first witness to the corpse of the dead priest. Thendral's family moves out of the city's outskirts and unknowingly into the apartment right opposite Vetri's home. Only then does Vetri realize that her family is arranging a groom for her, and that people will start questioning her morals if the police keep visiting her.
Eventually, Thendral reveals that she saw two vehicles outside the church that day: one belonging to Jessica and another black SUV driven by a group of mysterious young men. Thendral is attacked by a group of thugs driving a similar SUV, but is saved by Vetri. After this incident, Vetri and Thendral start dating and fall for each other. At around the same time, Jessica's body is found at a landfill site, and it is revealed that she was pregnant at the time of her murder. Her husband, the director of a leading TV channel, claims that they have only recently tried to conceive.
Vetri's investigation soon leads them to a petrol bunk close to the church. The CCTV captured the men in the black SUV. At the same time, Thendral notices that the men are outside her apartment. She phones Vetri, who instructs her to shut all the doors and stay indoors. When Vetri shows up, the men have gone. When he goes home, he finds that Abhinaya has hanged herself to death. The police concludes that she committed suicide, since there was no sign of intrusion. At her funeral, Abhinaya's mother reveals that a few days ago, Abhinaya had asked her father for .
Thendral reveals that one of her doctor friends treated Aravind and Abhinaya and that Aravind is infertile, leading Thendral to theorize that Abhinaya might have been unfaithful. While going through Abhinaya's postmortem report, Vetri realizes that her body contained traces of clomiphene, similar to Jessica's body. After talking to the coroner, Vetri learns that there is a third young woman who matches this pattern. Realizing that Aravind might be hiding something, Vetri confronts him, who admits that he and Abhinaya had opted for an artificial insemination using his own sperm.
Vetri visits Tulsi at the hospital and, on inquiry, realizes she is hiding something. He requests all the files on patients who have undergone artificial insemination at the hospital. He also notices that Kousalya, a famous TV artist, is successfully treated at that hospital. While studying the files, Vetri realizes that the documents on artificial insemination patients have an unusual watermark with the number 23. The following day, Vetri visits Kousalya and her husband to ask whether they have been blackmailed recently.
Although the couple denies everything, Vetri asks his team to tap their phones, especially incoming calls. True enough, Kousalya receives a call instructing her to pay a large sum of money to keep quiet about information that could destroy her career. Vetri and his team shadow the young couple the next day. Kousalya and her husband are seen withdrawing money from a bank and driving through a busy street. Just then, a young man, covering his face, forcefully enters their car and takes the money. By the time Vetri catches up with them, the man has escaped. However, Vetri's men had placed a tracker on the bag containing the money.
Vetri easily tracks the person to his apartment and overpowers him for interrogation. The person reveals himself as Gaurav and is part of a gang that has been blackmailing several women in the city who have legally undergone artificial insemination at Tulsi's hospital. One of their first victims was Jessica, an ardent cricket fan. She had hired Gaurav's gang to get hold of her favorite cricket player's sperm to conceive his child. However, she soon felt guilty. Feeling that they might get caught, Gaurav killed her and the priest who heard her confession.
The next woman was the politician's daughter-in-law, who slit her own wrists at her baby shower. Her father-in-law wanted his grandson to be a politician like him, so he arranged for her to be inseminated with his own sperm. Finally, there was Abhinaya, who learned from Gaurav's partner John Matthew that Tulsi lied about using Aravind's sperm and instead inseminated her with someone else's sperm. John then blackmails Abhinaya for , or else he will expose the truth and humiliate her family. Abhinaya finally goes back to Tulsi to get an abortion. When Gaurav's gang learns about this, they come to Vetri's house that day when Thendral saw them. They then killed Abhinaya and arranged for it to look like a suicide. After the confession, Vetri kills Gaurav in a fit of anger.
As Vetri and his men head over to the hospital to arrest Tulsi, Vetri suddenly remembers that a few years ago, a man named John Matthew reported that his wife had gone missing. John was upset that his wife did not want to bear his children and instead wanted artificial insemination with a much superior male. A few days later, she was found dead. Since then, John had gone missing. Vetri had one of his men look into John's disappearance.