A down and out cop lands the case of a lifetime when four suspects are nabbed in the assassination attempt of a prime time journalist. The case turns out to be a devious maze where nothing is what it looks like. The pursuit of it leads him to the dark netherworld - the 'Paatal Lok', and to shocking discoveries in the past of the four suspects.

Arnab tries to help Ruksahana, who is found under mysterious circumstances in a house. He lets her stay at his home until he discovers something strange about her.