An unknown hacker named "Z-43" demands an unusual ransom from the public to terminate a doctor and a principal to rescue the victim. Thus begins the wicked game of cyber war between The White Owl and Kerala police and a hunt to catch Z-43.
Z-43 reveals a horrific truth about Principal Shiney Matthew and Doctor Rangaram to the public. People get furious after knowing the truth and start protesting against them. Kerala police decides to shift them to a safer zone.
While police still having trouble investigating on Z-43,one of the officer Ranjith thinks that the case is going on a wrong direction and decides to take this matter in his own hands.
After many failures, Ranjith is still determined to find Z-43 on his own. Ranjith receives a video from an unknown number of his nephew being followed by a stranger.