Set in the hill regions of Kodaikanal, the story revolves around the illegal trade of highly potent psychoactive mushrooms (Vattakhanal is the name of a real village in Kodaikanal). A cunning man named Kathiravan grooms three orphans, including Sathya, to unknowingly run his drug empire. The plot thickens when a vengeful widow and a love interest threaten Kathiravans control, forcing a collision of betrayal, vengeance, and the truth.