Gargi is a school teacher from a struggling family consisting of her dad Brahmanandam who works as a security guard in an apartment building, her mom who sells homemade rice batter and her younger sister Akshara who's in middle school. Their life becomes chaos when dad is accused along with 4 other men of having assaulted a child. Gargi is steadfast in her resolve to prove her dad's innocence, as he's her hero, having protected her as a child from a perverted teacher, encouraging her to stand up to such evil.

At the receiving end of public hatred, they're abandoned even by a family friend who's a successful lawyer. But his assistant, a no-note lawyer, Indrans Kaliaperumal, agrees to represent them as he has no reputation to lose. At the hearing, while questioning the investigating officer, Indrans uncovers that the victim was wrongly medicated with a high dose of barbiturates, thus rendering her testimony (identifying Brahmanandam as the culprit) inadmissible.

Further, he meets the victim's dad, who reveals that it was he who made her identify Brahmanandam (certain of his guilt), as she was catatonic with trauma, unable to function at all. All this puts into question the evidence, this enabling him to obtain conditional bail for Brahmanandam.

When her dad's colleague, who had earlier claimed to have been at home all day on the fateful day, inadvertently reveals that he, in a drunken stupor, had actually been the first to discover the child lying there, and had alerted Brahmanandam, Gargi starts doubting her dad's claims that he'd been drinking at that time. She confirms her suspicions by visiting the child again and showing her a picture of the 5th culprit.

It's revealed, when the child identifies him, that Brahmanandam was indeed the culprit, leading to his arrest and conviction. Gargi takes a moment outside, to quietly come to terms with this horror. As the credits roll, we discover that she and her family have moved on, having reconciled with the victim and her dad.