While trying to gather evidence, K.D. Pathak is attacked by a colony of bats. He goes inside a cave to investigate and finds that someone has been feeding the bats. Then, K.D. Pathak hands over the food samples collected from the cave to a forensic doctor. The doctor informs K.D. Pathak that he found traces of three different chemical substances in the food. K.D. Pathak proves that the culprit trained the bats to attack a person who has been sprayed with the pheromones. With the culprit having meticulously planned the murders, can K.D. Pathak find him and prove that Hiren is innocent?