The film begins with the fall of a woman from the terrace of an apartment building. Then we are introduced to Inspector Kaalidas (Bharath), a good cop, who is shown convincing a man against killing himself. Kaalidas then proceeds to investigate the woman’s death, which he presumes to be a suicide based on initial observations. Later, he visits residential apartments and tells them that they can reach out to cops for their issues. However, Kaalidas’ extreme work pressure creates a strain on his relationship with his wife, Vidyaa (Ann Sheetal).
One day, a mysterious man (Aadhav Kannadasan) arrives at Kaalidas’s house looking for a place to rent. After initially turning him down, Vidyaa leases out the first floor of their house to the man, who is revealed to be a disc jockey. Meanwhile, another woman dies after falling from her apartment terrace. The Deputy Commissioner of Police (Velraj) ropes in the experienced Assistant Commissioner of Police (ACP) (Suresh Menon) to assist in the investigation. Kaalidas suspects that the deceased women could be victims of the Blue Whale Challenge. However, the ACP suspects the events to be connected to murders.
Further investigations reveal that both victims had quite a few similarities. Both had fairly discontented married lives, and neither woman had any children. The respective apartment cameras were either not working or had been turned off during the incident. When the police restore the broken smartphone belonging to the second victim, they find a series of intimate exchanges between her and a guy called Aarav (Yukendran). Subsequent investigation of the death of the first victim also leads the police to conclude the existence of an extra-marital affair. However, the alibis of the captured men prove they were not at the scene of the crimes. Meanwhile, Vidyaa starts developing a close bond with her tenant, who resembles “Pappu”, her college love.