Karuppu

Binu and her father Mattancherry Sukumaran travel from Kerala to Chennai by train for Binu's liver transplant treatment, carrying 60 sovereigns of gold meant to fund the surgery. During a halt at an intermediate station, a group of thieves steal their bag. The duo file a complaint at a nearby police station, where the police later claim to have recovered only 45 sovereigns of the stolen gold. They are informed that the jewels can only be returned through a Return of Property petition filed in court.

Desperate to recover the gold, Binu and Sukumaran approach Baby Kannan, a powerful advocate who controls the local court through corruption and influence. Instead of helping them, Baby Kannan deliberately drags the case for money, exploiting the family until they slowly lose hope of getting the jewels back. Unable to bear the injustice any longer, Sukumaran prays to and seeks help from Vettai Karuppu, the guardian deity of the Seven Wells, also known as Ellaswamy. Karuppu decides to punish Baby Kannan and enters the court disguised as a newly transferred advocate named Saravanan to fight Binu's case legally.

Saravanan soon learns how deeply corrupted the court system is. He also meets Advocate Preethi, who explains Baby Kannan's influence over the entire court. During the first hearing, Baby Kannan manipulates the proceedings by creating confusion through multiple petitions filed under different advocates, causing the hearing to become invalid. Saravanan secretly uses his supernatural powers to counter the corruption, which is witnessed by both Preethi and Baby Kannan. Baby Kannan then challenges Saravanan to win the case without using any of his powers. Despite several obstacles, Saravanan eventually succeeds in retrieving the jewels. However, the victory comes too late, as Binu dies before she can undergo the transplant.

Enraged, Saravanan decides that nobody else seeking justice at the court shall be delayed or denied. He takes up a sexual assault case involving a woman. Realising that powerful men connected to Baby Kannan are behind the crime, Saravanan entrusts the case to Preethi. Earlier, Preethi had wished for a modern court where nobody could lie and where old unresolved cases would finally receive justice.

During the first hearing of the assault case, Baby Kannan unexpectedly finds himself unable to lie in court and is forced to reveal the truth. His confession angers a minister connected to the crime, who decides to eliminate him. Baby Kannan slowly realises that these changes are part of Karuppu's divine intervention. Karuppu also begins eliminating crime within the boundaries of the Seven Wells, leading to old cases being resolved and preventing new crimes from taking place. Baby Kannan notices that even the minister's men are unable to commit crimes within the area protected by Karuppu, whose powers are limited only to the Seven Wells.

Determined to escape Karuppu's influence, Baby Kannan plans to relocate the court outside the protected area. He murders the judge who opposes the move, then engineers chaos inside the court complex, causing the building to collapse. Using the incident to his advantage, he successfully pushes for the relocation of the court temporarily in another locality, in Sriperumbudur IT park. However, Baby Kannan's license to practice law gets suspended when he attempts to bribe the new judge, and he continues to be haunted by Karuppu's presence and warnings. During the inauguration ceremony of the new court, Baby Kannan arrives with armed men to threaten everyone present. They are stopped by the Deputy superintendent of police Duraisingam, who is revealed to be Kaaval Karuppu, the guardian deity of the new area. The deity ultimately kills Baby Kannan, ending his reign of corruption. Later, Preethi has a vision of Binu and her father eating biryani together peacefully as Binu wished.