Journalist Chandrashekhar is chasing down a lead in Kerala when he bumps into Vaishali (Anindita Bose) after being rescued from a strange weather occurrence. Meanwhile, Meenu is discussing her night school student and police informer Gopal's disappearance with her friend and police officer Hassan when he is called in to office to get some disturbing information about an upcoming snowstorm.

Das calls on Pant moments before another natural disaster strikes. Meanwhile, in some morbid lab, a sadistic doctor is seen toying with young lives. Meenu shares her concern about Gopal with Hassan who promises to send his best officer, Sukhdeep Singh, to help. Chandra and Hassan go to Kala Mill where Gopal was last seen and make some serious discoveries.

Another city is struck by the acid rain. Gopal and Bashir try hard to escape their kidnappers. Hassan goes to see a professor in jail and uncovers a possible plan of assassination. Das asks Pant to acquire the video found on the mountaineer's phone.