Sreedhar Prasad is a RAW field agent who is assigned with the task of investigating a bomb blast that killed 30 innocent college students. Sreedhar operates under the name of Mahesh Aravind, a planter from Udumbanchola and chooses a township Wintergreen as his temporary residence during the course of the investigation. Mahesh establishes a friendly relation with ACP George Alexander, who was the official in charge of the criminal investigation. As the investigation proceeds, it is understood that the bomb blast was connected with a chain of crimes that happened in the area including the missing of a scientist Guhan Menon from Baddapur Space Research Organization (BSRO), who is later revealed to be killed. It is revealed that Shankar Dev Rana.