Hantée par des flashs d'un passé tragique, une détective privée, Meenakshi Iyer, alias P.I. Meena, commence à enquêter sur ce qui semble être une banale affaire de délit de fuite, avant de découvrir qu'il y a plus que ce que l'on croit et de s'empêtrer dans un réseau de conspiration qui déchire les mondes de tous ceux qui s'en approchent.
A brutal road accident that kills a young man. When the man’s mother, Chandana, tells Meenakshi that it wasn’t an accident and requests her to investigate it, Meenakshi refuses saying PI’s have no business investigating murders. But can she stay away?
Still unsure, Meenakshi starts digging. She starts suspecting that the dead man was somehow linked to a mysterious virus outbreak in the village of Littnong, Eastern Himalayas.
A virus starts breaking out around Kolkata. Meenakshi’s investigation picks up speed. A Central Intelligence officer warns Meenakshi to stay away from something that’s way beyond her comprehension.
Kolkata is gripped by the virus outbreak. Meenakshi links the Kolkata virus to the Littnong one. Unknown to her, games are being played by her own accomplices about the identity of the virus. She must go back to Littnong to find some light.
A few earth-shattering breakthroughs stab Meenakshi’s heart. She decides not to continue with her investigation any more only to be brought back to it by her friend. Because now it is not just a man’s death but the need to stop a genocide.